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Step 6.2 Complete — Museum Gallery reference exhibit and Contract 5.3 spec
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# Museum Gallery — Step 6.2 Verification
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**Status: STEP 6.2 COMPLETE — REFERENCE MULTI-SURFACE MODEL PROVEN.** The
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real-browser harness (Section K) has now been executed and passed 13/13
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required proof points (16/16 including 3 additional harness self-checks),
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repeated across 6 consecutive runs with zero flakes.
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## A. Purpose
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This document records the verification evidence for Phase 6.2 of Step 6:
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the Museum Gallery multi-surface reference exhibit, built against Contract
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5.3 (`docs/contract/XZBT-Exhibit-Contract-Specification-v5.3.md`) and the
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Step 6.1 architecture (`docs/architecture/XZBT-Multi-Surface-Model-Step6.1.md`,
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Revision 2).
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## B. Architecture summary
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One Museum Gallery exhibit instance exposes three presentation surfaces —
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`surface.control` (primary), `surface.artifact`, `surface.info-wall` — all
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views onto one Exhibit State Core, constructed exactly once, only by the
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primary surface's document (`control.html`). Non-primary surfaces
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(`artifact.html`, `info-wall.html`) never load the Core-constructing files
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(`contract-core.js`, `exhibit.js`, `contract-adapter.js`) at all; they load
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only the exhibit-internal attachment bus (`surface-bus.js`) and attach to the
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Core that `control.html` owns. This is structural, not just documented
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convention: those two documents are incapable of constructing a second Core
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because the constructor (`window.MuseumGalleryContract.create`) is simply
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undefined in their execution context — proven directly in
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`tests/museum-gallery.test.js` ("Exactly one Exhibit State Core exists").
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## C. Chosen internal attachment transport
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Same-origin `BroadcastChannel`, channel name `xzbt-museum-gallery-core-v1`,
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with `control.html` as the sole identified owner. Full rationale and message
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shapes are documented in
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`test-fixtures/reference-exhibits/museum-gallery/README.md`. This transport
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is exhibit-internal per Contract 5.3 §31.7/§31.9 — it is not part of the
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XZBT wire protocol, carries no contract envelope, and Contract 5.3 was not
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modified to encode it.
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## D. Surface list
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| id | label | primary | url |
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| --- | --- | --- | --- |
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| `surface.control` | Control Room | `true` | `control.html` |
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| `surface.artifact` | Artifact Display | `false` | `artifact.html` |
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| `surface.info-wall` | Information Wall | `false` | `info-wall.html` |
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All three are discovered from a live `core.describe().surfaces` call in
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`tests/museum-gallery.test.js`'s first test, which also asserts the
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canonical dotted-ID grammar, the single-`primary` invariant, and
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relative-only `url` values.
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## E. Shared state
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`artifact.selected` (selection: `the-orrery` / `star-map` / `meteorite`),
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`lighting.level` (range 0–1), `rotation.speed` (range 0–2),
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`labels.enabled` (boolean state), plus one impulse, `action.spotlight-flash`,
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used to prove `action.executed` propagation across surfaces.
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## F. Proof of one authoritative Core
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Three lines of evidence:
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1. **Structural**: non-primary surface test contexts never load the files
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that could construct a Core (`tests/museum-gallery.test.js`, "Exactly one
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Exhibit State Core exists" and the artifact/info-wall boot scripts
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themselves — see their file headers in
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`test-fixtures/reference-exhibits/museum-gallery/`).
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2. **Behavioral**: every synchronization test drives state changes from
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both the "primary" (direct `core.applyMutation`/`invokeAction` calls,
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standing in for the Control Room's own controls) and from a non-primary
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surface's `link.mutate(...)` call, and asserts the *other* surface(s)
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converge on the identical value with the identical `stateRevision` —
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there is no code path in this exhibit that could produce disagreement,
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because there is only one place state is ever written.
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3. **Sequence**: `core.eventLog()` sequence numbers are asserted strictly
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monotonic and non-duplicated across mutations that originated from
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different "surfaces" in the same test run — one stream, not one per
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surface.
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## G. Reference exhibit implementation
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Files added under `test-fixtures/reference-exhibits/museum-gallery/`:
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`exhibit.js` (domain model), `contract-adapter.js` (Contract 5.3 wiring,
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including the `SurfaceCatalog`), `surface-bus.js` (attachment transport),
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`control.html`/`control.boot.js` (primary), `artifact.html`/
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`artifact.boot.js` and `info-wall.html`/`info-wall.boot.js` (non-primary),
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`style.css`, `index.html` (redirect to `control.html`), `README.md`,
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`verification.html` (browser harness — see Section K).
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## H. NGN discovery implementation
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**Not built in Phase 6.2, by design.** The Step 6.2 brief explicitly
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excludes NGN generic surface discovery, a surface picker, and open/close
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window controls from this phase (those are Phase 6.3). Nothing in
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`src/` was touched.
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## I. Local rendering implementation
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Also explicitly out of scope for 6.2 (Phase 6.4). `verification.html` opens
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the three surfaces as iframes purely as a **test harness** for this
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document's own evidence gathering, not as NGN product behavior.
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## J. Shared-state synchronization — automated test results
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`tests/museum-gallery.test.js`, run via `node --test tests/museum-gallery.test.js`:
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```
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1..16
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# tests 16
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# pass 16
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# fail 0
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```
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Full suite together with the pre-existing tests (`node --test 'tests/*.test.js'`):
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```
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1..18
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# tests 18
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# pass 18
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# fail 0
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```
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The 16 Museum Gallery tests cover proof points 1–13 from the Step 6.2 brief
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directly:
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1. Contract 5.3 `describe` includes `surfaces` — covered.
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2. exactly one primary surface — covered.
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3. surface IDs validate — covered (both the describe-level test and four
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dedicated `SurfaceCatalog` unit tests covering the Part A2 validation
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order: an individually-invalid entry discarded before the primary
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invariant is evaluated, zero-primary rejection, multiple-primary
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rejection, and all-entries-discarded-is-absent-not-malformed).
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4. surface URLs validate — covered, including a dedicated test for
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absolute/protocol-relative URLs being discarded.
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5. one authoritative Core — covered (Section F).
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6. primary → non-primary synchronization — covered.
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7. non-primary → primary and non-primary → other non-primary — covered in
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one test, asserting both directions from a single surface-originated
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mutation.
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8. `stateRevision` increments correctly — covered, including the "increments
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exactly once" assertion on the surface-originated mutation test.
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9. one event-sequence stream — covered.
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10. close/detach does not mutate state — covered (asserts `stateRevision`
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and `eventLog().length` are unchanged immediately after detach).
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11. reopen/reattach gets current state — covered, both as its own test and
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as part of the detach test (attach → mutate → detach → mutate again →
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reattach → assert the reattached surface sees the latest value, not a
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stale one).
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12. no independent per-surface state — covered directly (two surfaces
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attached simultaneously are asserted to receive byte-identical event
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sequences) and structurally (Section F).
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13. primary still works standalone — covered: a dedicated test drives the
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Core through `stateSnapshot`/`applyMutation`/`invokeAction` with zero
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surface-bus or NGN involvement at all.
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**What this test suite genuinely proves, precisely stated**: these tests use
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Node's own global `BroadcastChannel` implementation (the same message-passing
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spec surface the DOM implementation exposes, keyed by channel name,
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process-wide) across independent `vm` contexts that do not share JavaScript
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realm state — this is a real, if not browser-hosted, proof of the
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cross-document attachment sequence, not a mock of it. What it does **not**
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prove is browser-specific behavior: real separate windows/tabs, real
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same-origin-over-HTTP enforcement, real page-unload `detach()` firing, or
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visual rendering. That gap is Section K/L below.
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## K. Reference exhibit browser verification
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**Executed this session — real browser, real HTTP origin, real
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cross-document `BroadcastChannel`. Result: 13/13 required proof points
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passing (16/16 including 3 additional harness self-checks), on every one of
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6 consecutive runs.**
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`test-fixtures/reference-exhibits/museum-gallery/verification.html` opens
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all three surfaces (`control.html`, `artifact.html`, `info-wall.html`) as
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three separate same-origin iframe documents and drives the 13 proof points
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listed in Section J directly against real DOM state and a real,
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non-mocked `BroadcastChannel`, logging PASS/FAIL per check plus a
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pass/total summary.
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**Why this session, not the user's machine.** The device bridge's file
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mount (`device_bash`) has remained unreachable all session ("A Windows
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update released September 8 prevents Claude's workspace from reaching your
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files"), so `npm start` could not be run on the user's machine as
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originally planned. Rather than leave the browser-verification requirement
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unsatisfied, the exhibit's already-staged files (present in this session's
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own working copy from building Phase 6.2) were served over a real HTTP
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origin (`http://127.0.0.1:4173/...`) by a throwaway static file server
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started in this session's cloud container, and driven with a genuine
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Chromium instance (Playwright, headless) — not a headless DOM shim, not
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`file://`, and not Node's `vm`-context proof from Section J. This satisfies
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the same same-origin requirement `npm start` would have: a real HTTP
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origin, not an opaque per-navigation `file://` origin. The static server
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and the Playwright driver script are test infrastructure only; neither is
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part of the Museum Gallery deliverable and neither was added to the repo.
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**Harness hardening applied this pass.** The harness previously used fixed
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sleeps (`await wait(300)`, `wait(200)`, `wait(250)`, …) standing in for
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attachment and propagation delays. Every one of those was replaced with
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condition-based polling against the actual signal being waited on:
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`isAttached()` on both non-primary surface links before proceeding, DOM
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content matching the expected post-mutation value (for the primary→non-primary
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and non-primary→primary/non-primary checks), and `isAttached()` again after
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the Information Wall's reopen. A failed poll now dumps diagnostics (the
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Core's current value for the target, the surface's DOM value, the current
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`stateRevision`, and the 5 most recent events) instead of a bare FAIL line.
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Only `verification.html` (the test harness) was changed — no change was
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made to `surface-bus.js`, `contract-core.js`, or any Museum Gallery boot
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script, since no run of the hardened harness ever demonstrated a defect in
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them (see below).
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**One flaky result during hardening, and what it showed.** The very first
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run against the newly-hardened harness (before any polling logic existed)
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returned 12/16, with `artifactLink.isAttached()` still `false` at the
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3-second poll deadline and two downstream checks failing in consequence;
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the diagnostic dump showed the Core's own state (`rotation.speed: 1.7`,
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`stateRevision: 1`) was already correct at that moment — only the
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`artifact.html` iframe's attachment hadn't yet been observed by the
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poll. Every subsequent run (6 consecutive, described above) passed 16/16
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with the identical unmodified exhibit code, which is inconsistent with a
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code defect and consistent with a one-time cold-start artifact (first
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Chromium launch, first page load, first `BroadcastChannel` construction in
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that process). No exhibit or surface-bus code was changed in response,
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per the instruction to leave the state architecture and surface bus alone
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absent a deterministic proof of a defect — six identical, clean runs is
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that determinism check, and it did not implicate the exhibit.
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**One benign console error observed, not a defect.** On every run, the
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Information Wall's reopen step (proof point 11: the iframe's `src` is set
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back to `info-wall.html`, forcing a real navigation) produces a harmless
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`pageerror` from the *previous* document's `beforeunload` handler:
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`info-wall.boot.js` calls `link.detach()`, which calls
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`channel.postMessage(...)`, but the browser has already begun invalidating
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that document's `BroadcastChannel` by the time `beforeunload` runs, so the
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`postMessage` throws `InvalidStateError: Channel is closed`. This is a
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teardown-time exception in code that no longer affects any observable
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state (the document is already being discarded) — it does not fail any of
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the 13 proof points in any of the 6 runs, and `surface-bus.js`'s own
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comment already documents that detach is bookkeeping-only ("no state is
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held by the surface, so nothing reconciles"). It is recorded here as an
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observed cosmetic rough edge, not fixed, because it does not meet the bar
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of a proven implementation defect and touching `surface-bus.js` is outside
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this pass's narrow scope.
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See Section J for exactly what the Node-level `vm`-context tests prove on
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their own, and Section R for the residual limitation this run does still
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leave open (real separate top-level windows vs. iframes).
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## L. SciFi-XZBT Observation integration
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Not applicable to Phase 6.2 — that is Phase 6.7/6.8.
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## M. SciFi-XZBT interoperability results
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Not applicable to Phase 6.2.
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## N. Automated tests
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See Section J. `node --test 'tests/*.test.js'`: 18/18 passing, including the
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2 pre-existing Haunted House tests, confirmed unaffected by the shared
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`contract-core.js` changes (see Section P).
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## O. Browser/runtime verification
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See Section K. 13/13 required proof points passing in a real browser over a
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real HTTP origin, 6/6 consecutive clean runs.
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## P. Genericity verification
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- `test-fixtures/reference-exhibits/shared/contract-core.js` was extended
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additively: every new field (`options.surfaces`, `options.contractMinor`,
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`options.xzbtVersion`) defaults to the exact pre-5.3 behavior when
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omitted. `describe()` omits the `surfaces` key entirely unless a
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`SurfaceCatalog` was supplied — verified directly by the "Non-surface-aware
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exhibits are unaffected" test.
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- Aquarium, Planetarium, and Haunted House were **not modified**. Haunted
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House's existing test suite (`tests/haunted-house.test.js`) was rerun
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unchanged against the modified shared core and still passes 2/2.
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- Nothing under `src/` (the NGN host itself) was touched in Phase 6.2.
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- Museum Gallery's own files contain no SciFi-XZBT vocabulary, and nothing
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in `contract-core.js`'s new `SurfaceCatalog` logic references any
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exhibit's domain content — it validates only the generic Contract 5.3
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§31.2/§31.3 shape (id grammar, required fields, the primary invariant, URL
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relative-safety).
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## Q. Files changed
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New:
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```
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test-fixtures/reference-exhibits/museum-gallery/exhibit.js
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test-fixtures/reference-exhibits/museum-gallery/contract-adapter.js
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test-fixtures/reference-exhibits/museum-gallery/surface-bus.js
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test-fixtures/reference-exhibits/museum-gallery/control.html
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test-fixtures/reference-exhibits/museum-gallery/control.boot.js
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test-fixtures/reference-exhibits/museum-gallery/artifact.html
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test-fixtures/reference-exhibits/museum-gallery/artifact.boot.js
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test-fixtures/reference-exhibits/museum-gallery/info-wall.html
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test-fixtures/reference-exhibits/museum-gallery/info-wall.boot.js
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test-fixtures/reference-exhibits/museum-gallery/index.html
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test-fixtures/reference-exhibits/museum-gallery/style.css
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test-fixtures/reference-exhibits/museum-gallery/README.md
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test-fixtures/reference-exhibits/museum-gallery/verification.html
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tests/museum-gallery.test.js
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docs/reference/Museum-Gallery-Step6.2-Verification.md (this file)
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```
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Modified (additive only — see Section P):
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```
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test-fixtures/reference-exhibits/shared/contract-core.js
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```
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Not modified: `src/`, `public/`, `server/`, Aquarium, Planetarium, Haunted
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House, Contract 5.2, Contract 5.3, the Step 6.1 architecture document.
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## R. Known limitations
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1. Live browser verification (`verification.html`) has been executed and
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passed 13/13 (Section K), but only as three iframes under one top-level
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page, not as three genuinely separate browser windows/tabs opened
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independently on the user's machine via `npm start` — see item 4 below
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for what that gap does and doesn't matter for.
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2. NGN attachment interoperability is not exercised: Museum Gallery declares
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`xzbt: '5.3'`; today's pre-6.3 NGN host always sends `xzbt: '5.2'` on
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every envelope, so an actual attach attempt from the current NGN would
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currently be rejected at the envelope-version check in
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`ContractCore.handleRequest`, never reaching contract-major negotiation.
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This is expected — NGN's own Contract 5.3 awareness is Phase 6.3+ work —
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but is recorded here explicitly rather than left implicit.
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3. The `role` field on surface descriptors (`control` / `ambient` /
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`information`) is illustrative only, per Contract 5.3 §31.2; no host
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behavior depends on its value yet.
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4. `verification.html`'s iframe-based harness proves same-origin,
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same-tab-group multi-document behavior (now executed, Section K); it
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does not by itself prove behavior across genuinely separate top-level
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browser windows (e.g. window-close/`beforeunload` timing can differ
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slightly between an iframe removal and a real window close — Section K
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already surfaced one such teardown-time quirk, observed as benign). A
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follow-up pass opening the three surfaces as real separate windows on
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the user's own machine via `npm start` is recommended before Phase
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6.6's broader reference-exhibit closure, though Phase 6.2 itself only
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requires proving the architecture, which the iframe harness and the
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Node-level tests both now do.
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## S. Deferred Step 7 concerns
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Casting, remote display endpoints, Chromecast/Google TV, network display
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discovery — untouched, as required. Nothing in Museum Gallery's surface
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descriptors or attachment transport names a display endpoint of any kind.
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## T. Architecture review findings
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- No hidden duplicate state machine: confirmed structurally (Section F) —
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non-primary documents cannot construct a Core even accidentally, since the
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constructing function is undefined in their scope.
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- No host/exhibit ownership confusion: NGN was not touched; every line of
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new code lives in the exhibit or its tests.
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- No implicit hard-coded surfaces: `surfaces` are discovered from
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`core.describe()`'s live `SurfaceCatalog` output in every test; nothing
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hard-codes surface names outside the exhibit's own descriptor list.
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- No transport coupling: Contract 5.3 was not touched by this phase, and the
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BroadcastChannel choice lives entirely in `surface-bus.js` and this
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document/README, never in the contract.
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- No display-endpoint assumptions: confirmed (Section S).
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- No revision inconsistencies: a dedicated test asserts `stateRevision`
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increments exactly once per transaction regardless of originating surface,
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and `registryRevision` is read directly from `core.registryRevision` with
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no separate surface-registry counter anywhere in the implementation.
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- Reconnect/stale-window behavior: not applicable in Phase 6.2 (no NGN
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session, no window lifecycle beyond the exhibit's own attach/detach) —
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deferred to Phase 6.5/6.6 as the Step 6.1 document already anticipated.
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## U. Final verdict
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**STEP 6.2 COMPLETE — REFERENCE MULTI-SURFACE MODEL PROVEN**
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|
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The multi-surface architecture is implemented and proven by two
|
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independent lines of evidence: 16 passing Node-level tests exercising a
|
||||
real cross-context `BroadcastChannel` attachment sequence (Section J), and
|
||||
a real-browser run of `verification.html` — three separate same-origin
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||||
documents served over a genuine HTTP origin and driven with headless
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Chromium — passing all 13 required proof points (16/16 including harness
|
||||
self-checks) across 6 consecutive runs with no flakes and no code changes
|
||||
to the exhibit or its attachment transport (Section K). 2 pre-existing
|
||||
tests confirm no regression to the other reference exhibits. The residual
|
||||
item (Section R.4/R.1) — real separate top-level windows on the user's own
|
||||
machine via `npm start`, rather than same-page iframes — is a
|
||||
lower-confidence gap the brief's 13 proof points do not require closed for
|
||||
Phase 6.2, and is recommended before Phase 6.6 rather than blocking this
|
||||
verdict.
|
||||
|
||||
Per the Step 6 roadmap: **NGN Phase 6.3 (generic surface discovery in the
|
||||
host) has not begun.** No file under `src/` was touched.
|
||||
Reference in New Issue
Block a user