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docs: close Step 6 with reconciled Contract 5.3 evidence

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docs/reference/XZBT-NGN-Step6.10-Closure-Report.md
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# XZBT-NGN Step 6.10 — Completion and Closure Report
**Date:** 2026-09-15
**Status:** STEP 6 COMPLETE WITH DOCUMENTED NON-BLOCKING FOLLOW-UP
**Technical Baseline:** 163de264388f1e411cf9e54f26f72a254888afd (contract-5.3-accepted-baseline)
**Closure Tag:** step-6-complete
---
## 1. Executive Summary and Closure Disposition
Following the completion and formal adjudication of the Step 6.10 completion gate, **XZBT-NGN Step 6 is complete and closed with documented non-blocking follow-up**.
All required Step 6 implementation, adaptation, integration, and verification tasks are finished. No further Step 6 implementation work remains.
The accepted technical baseline for Contract 5.3 multi-surface architecture is frozen at:
* **Commit:** 163de264388f1e411cf9e54f26f72a254888afd
* **Tag:** contract-5.3-accepted-baseline
This closure administration pass performs documentation and provenance reconciliation only. No application source code, automated test code, fixture implementation, protocol definition, or runtime logic is altered.
---
## 2. Milestone Dispositions
All Step 6 milestones have reached final adjudication and acceptance:
| Milestone | Disposition | Notes |
|---|---|---|
| **Step 6.1** | Complete | Multi-surface architectural model defined and documented (XZBT-Multi-Surface-Model-Step6.1.md). |
| **Step 6.2** | Complete | Multi-surface reference prototype validated against Museum Gallery. |
| **Step 6.3** | Complete | Surface discovery protocol and catalog validation implemented and verified. |
| **Step 6.4** | Complete | Local presentation panes integrated into NGN operator UI without additional contract sessions. |
| **Step 6.5** | **Satisfied by existing implementation and later evidence** | Multi-surface state synchronization proof adjudicated satisfied (see §3). |
| **Step 6.6** | Complete and accepted | Reference exhibits validated under Contract 5.3. |
| **Step 6.7** | Complete and accepted | SciFi-XZBT Observation surface adapted, packaged build verified, live 8-point verification passed. |
| **Step 6.8** | **Complete and accepted** | Multi-surface behavior against SciFi-XZBT validated; single unreproduced renegotiation noted as follow-up (see §4). |
| **Step 6.9** | **Complete** | Architectural and protocol conformance review passed across all 18 review areas (see §5). |
| **Step 6.95** | **Complete** | Verification evidence and cross-document references reconciled. |
| **Step 6.10** | **Complete** | Formal completion gate passed: Step 6 closed. |
---
## 3. Step 6.5 Adjudication: Synchronization Proof
Step 6.5 was adjudicated by the Step 6.10 completion gate as:
> **SATISFIED BY EXISTING IMPLEMENTATION AND LATER EVIDENCE**
The requirement for shared-state synchronization across surfaces was satisfied by the verified architecture and evidence rather than requiring a hypothetical multi-host topology:
1. **Authoritative Exhibit State Core:** A single state core maintains all authoritative exhibit state, revision counters (stateRevision), and mutation dispatch.
2. **Snapshot and Revision on Attachment:** When a secondary surface attaches, it immediately receives a full immutable state snapshot stamped with the current stateRevision.
3. **Ongoing State and Event Propagation:** Owner-mediated mutations and events broadcast monotonically to all attached surfaces.
4. **Owner-Routed Secondary Interactions:** Interactions initiated on secondary presentation surfaces do not mutate state directly; they are routed through the owner's authority chokepoint (pplyMutation).
5. **Clean Detach and Reopen Lifecycle:** Detaching and reattaching surfaces preserves monotonic participant counts without ratcheting or state corruption.
6. **Cross-Document Evidence:** Cross-document presentation synchronization was proven in Museum Gallery (Step 6.6) and independently verified in SciFi-XZBT across separate browsing contexts (Step 6.7/6.8).
No requirement exists or was ever specified for multiple NGN instances controlling a single exhibit.
---
## 4. Step 6.8 Completion and Accepted Status
Step 6.8 (multi-surface behavior against SciFi-XZBT) is **complete and accepted**.
The handshake gating mismatch identified during Step 6.8 preparation (where exact-string advisory envelope checks dropped xzbt: '5.3') was resolved in commit 745912e, verified by automated regression tests, and confirmed in live browser testing.
### Residual Observation (Non-Blocking Follow-Up)
During live multi-surface testing in Step 6.8, one session renegotiation was observed once. This event:
* could not be reproduced under repeated testing,
* had no architectural defect or protocol violation identified,
* preserved exhibit state throughout,
* recovered cleanly without operator intervention, and
* remains documented as a non-blocking follow-up observation.
This observation is not characterized as fully explained, definitively benign, operator error, or a known race condition, as no definitive root cause was isolated. It does not block Step 6 completion.
---
## 5. Architectural Review and Invariants (Step 6.9 Summary)
A comprehensive architectural and protocol conformance review covering 18 functional areas confirmed that the Step 6 implementation conforms to Contract 5.3 and adheres to all architectural constraints.
### Core Architectural Conclusions
* **Generic NGN Core:** The NGN host core (src/**) contains zero exhibit-specific or SciFi-specific code. All controls and surfaces are descriptor-driven.
* **Exhibit-Scoped Semantics:** All exhibit-specific logic (e.g. Starship visualizer, LCARD interface, Kokoro TTS, WebLLM) resides exclusively within exhibit and fixture code.
* **Single-Owner Authority:** All mutations flow through a single chokepoint (ExhibitHost.request()). Surfaces cannot establish independent contract sessions or bypass owner authority.
* **Non-Authoritative Surfaces:** Presentation surfaces are purely observational/presentational; they have no host transport or session authority.
* **Monotonic State Convergence:** State snapshots and revisions (stateRevision) advance monotonically; late-joining and reconnected surfaces converge immediately to current state.
* **Session Identity Protection:** Out-of-session and stale messages are rejected by session ID gating.
* **Fail-Closed Orphan Handling:** Orphaned surfaces (such as an Observation surface loaded without an active owner instance ID) enter an inert waiting state without inventing local authority.
* **Presentation and Surface Lifecycle Separation:** Opening an Observation surface does not alter the console overlay flag ( iew.observation), maintaining distinct lifecycles.
* **Owner-Scoped Generative and Audio Subsystems:** Generative AI (WebLLM), neural voice (Kokoro), and Web Audio (AudioContext) run exclusively within the console owner frame; surfaces instantiate none of these heavy resources.
* **Contract 5.3 Coherence:** Full Contract 5.3 conformance is maintained with verified backward compatibility for Contract 5.2 exhibits.
* **Test Verification:** All 154 automated tests and all 24 focused SciFi surface tests pass cleanly.
* **No Blocking Defects:** No blocking architectural defect was found.
### Verified Architectural Invariants
| Invariant | Status | Evidence |
|---|---|---|
| 1. Single authority for mutations | **VERIFIED** | All mutations route through ExhibitHost.request() and exhibit owner |
| 2. State immutability & revision tracking | **VERIFIED** | Snapshots are immutable; revisions advance monotonically |
| 3. Exhibit-generic NGN core | **VERIFIED** | Zero exhibit-specific code in src/** |
| 4. Surface presentation-only semantics | **VERIFIED** | Surfaces have no host transport, session authority, or mutation rights |
| 5. Same-origin security boundary | **VERIFIED** | Same-origin enforced across frames, URLs, and postMessage transports |
| 6. Contract 5.3 conformance | **VERIFIED** | All 12 Contract 5.3 conformance requirements satisfied |
| 7. Backward compatibility with 5.2 | **VERIFIED** | Contract 5.2 exhibits negotiate and function without regression |
| 8. Error isolation and recovery | **VERIFIED** | Surface-level errors stay within the pane; host session remains healthy |
| 9. Descriptor-driven rendering | **VERIFIED** | UI dynamically renders targets advertised in describe catalog |
| 10. Graceful degradation | **VERIFIED** | Invalid descriptors are safely discarded while valid entries are preserved |
| 11. Presentation/surface lifecycle independence | **VERIFIED** | Surface open/close does not toggle console overlay state |
| 12. Session identity & orphan fail-closed | **VERIFIED** | Stale traffic is rejected; orphaned surfaces remain inert |
---
## 6. Verification Evidence Summary
The technical baseline 163de2 is verified by the following test and live browser evidence:
* **Full Automated Test Suite:** **154 / 154** tests passing (
pm test /
ode --test).
- Connection and URL validation: 8 tests
- Host negotiation and state management: 32 tests
- Surface discovery and descriptor validation: 44 tests
- Local surface frame lifecycle: 20 tests
- PostMessage transport interop: 7 tests
- Reference exhibit integration: 43 tests
* **Focused SciFi Observation Surface Suite:** **24 / 24** tests passing (
ode --test tests/scifi-surfaces.test.js).
* **Live Museum Gallery Evidence:** Multi-surface presentation validated in live browser sessions (Step 6.2 and Step 6.6).
* **Live SciFi-XZBT 8-Point Verification:** Passed all eight live criteria:
1. Connected and synchronized as Contract 5.3 with two-surface descriptor catalog.
2. Observation pane opened with correct geometry and visible controls.
3. Observation pane showed no return controls, remained inert to background clicks, and did not alter console state.
4. Presentation targets converged across console and pane with advancing stateRevision.
5. Reload and close/reopen returned pane to current state without participant ratcheting.
6. Console WATCH EXPERIENCE affected only console overlay, leaving the Observation pane independent.
7. Observation frame instantiated no WebLLM, Kokoro, or AudioContext.
8. Transient events appeared simultaneously; disconnect/reconnect gave clean pane release and rediscovery; orphan URL presented inert waiting state without authority.
* **Packaging Verification:** Regenerated single-file standalone artifact verified for structural inlining (13 assets inlined, zero external references) and valid served-path handshake.
---
## 7. Blocking Items
**None.** There are no unresolved blocking defects, contract violations, or outstanding architectural blockers for Step 6.
---
## 8. Documented Non-Blocking Follow-Up Items
The following items are retained as non-blocking follow-up items for future operational observation or testing. None of these items block Step 6 closure:
1. **Unreproduced Session Renegotiation:**
The single unreproduced session renegotiation observed during Step 6.8 testing remains tracked for ongoing observation.
2. **Packaged Offline Direct Interaction:**
Opening the packaged dist/ artifact directly over ile:// and exercising hotkeys, WATCH EXPERIENCE, and audio playback has not been conclusively operator-verified (structural inlining and boot have been verified).
3. **Audible Sound Duplication and Quality:**
Auditory confirmation that audio is not duplicated between console and Observation pane, and that playback quality remains clear during concurrent surface display, requires sustained human listening.
4. **Generated AI Announcement Timing:**
Subjective timing quality and cadence of local AI-generated voice announcements appearing across surfaces requires sustained operator listening.
5. **Long-Running Ambient-Event Coexistence:**
Observation over an extended multi-hour session to confirm that ambient visual and audio events coexist without drift or missed events.
None of these items are represented as passed; they remain open, documented non-blocking follow-up observations.
---
## 9. Final Conclusion
Step 6 has satisfied all requirements of the Contract 5.3 multi-surface milestone. No further implementation work is required for Step 6.
XZBT-NGN Step 6 is formally closed at tag step-6-complete on top of accepted technical baseline 163de264388f1e411cf9e54f26f72a254888afd.
docs/reference/XZBT-NGN-Step6.7-Closure-Report.md
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# XZBT-NGN Step 6.7 — Closure Report
**Status: not fully closed.** As of 2026-09-15, Step 6.7's implementation, its
handshake defect resolution, the automated baseline, and the packaged
standalone-build verification are complete. The live NGN Observation
verification (Step 6.7B report §15, steps 1–13) has not been performed and is
the only remaining item. Step 6.8 has not been started.
**Status: accepted.** As of 2026-09-15, Step 6.7 is closed and
`f163de264388f1e411cf9e54f26f72a254888afd` is frozen as the accepted Contract
5.3 baseline by the annotated tag `contract-5.3-accepted-baseline`. The full
automated suite, the SciFi surface smoke suite, packaged standalone verification,
and the live eight-point NGN verification have all passed. *(Note: Step 6.8 was
subsequently completed and accepted, and Step 6 is closed at Step 6.10; see the
[Step 6.10 closure report](XZBT-NGN-Step6.10-Closure-Report.md).)*
- Step 6.7A (design, no code): [architecture report](../architecture/XZBT-NGN-Step6.7A-SciFi-Observation-Surface.md)
- Step 6.7B (implementation): [implementation report](XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md)
@@ -23,8 +25,10 @@ closed:
3. Source/fixture provenance for the SciFi-XZBT fixture — re-verified, and
extended with the packaging record (§5).
Not closed by this report: live browser verification of the Observation
surface through NGN (6.7B report §15, steps 1–13) — see §9.
The final two fixture-level presentation corrections are included in the
accepted baseline: the embedded Observation surface owns its NGN pane geometry,
and an orphaned Observation URL presents an inert waiting state without
creating authority.
## 2. Step 6.7 delivery summary
@@ -175,6 +179,7 @@ Re-verified after the packaging pass:
| `tests/postmessage-interop.test.js` | **7 / 7** (was 2 / 7) |
| `tests/scifi-surfaces.test.js` (inside the full run) | 24 / 24 |
| `tests/local-surfaces.test.js` (inside the full run) | 20 / 20 |
| SciFi Observation surface smoke suite | **24 / 24** pass |
| SciFi-XZBT contract harness | 21 / 21 |
| SciFi-XZBT real-adapter suite | 32 / 32 |
| `python devlog_editor.py --validate` | devlog is valid |
@@ -202,31 +207,53 @@ commit was requested):
The handshake correction that this report closes was committed earlier as part
of `745912e` ("Steps 6.4-6.7B …"), pushed to `origin/main`.
## 9. Remaining work
## 9. Accepted live verification
**Step 6.7 remains open for one item: live NGN Observation verification**
(6.7B report §15, steps 1–13). Not performed in this pass:
The final live NGN verification passed these eight points:
1. Connect NGN to the SciFi fixture; confirm connected · synchronized, Contract 5/3, and the target catalog.
2. Confirm the Surfaces panel lists exactly two entries (`surface.console` primary, no Open button; `surface.observation`).
3. Open the Observation pane; confirm it renders the current universe/preset within ~1 s, shows no exit chrome, and is inert to background clicks.
4. Confirm the console does not black out and `view.observation` stays `false`.
5. Drive `set` from NGN for the seven listed targets (universe, preset, alert, viewport frame, activity, pillars, warp-flight); confirm both surfaces converge with advancing `stateRevision`.
6. Reload the pane; confirm it returns to current (not default) state, and close/reopen does not ratchet the participant count.
7. Press WATCH EXPERIENCE; confirm the pane is unaffected and `view.observation` toggles only the console overlay.
8. Inspect the pane's frame: no WebLLM/Kokoro network activity, no `window.generativeExperience`, no `AudioContext`.
9. Confirm transient activity events and AI announcements appear on console and pane at the same moment.
10. Disconnect/reconnect NGN; confirm clean pane release and rediscovery.
11. Standalone `index.html` opened directly with interaction (hotkeys, WATCH EXPERIENCE, audio) — only the packaged boot is evidenced so far (§4).
12. Standalone two-window mirroring (`index.html?surface=observation&xi=<real id>` with no NGN present).
13. `?surface=observation&xi=nonexistent` alone; confirm a waiting state with no invented authority.
1. The SciFi fixture connected and synchronized as Contract 5.3 with its expected target catalog and two-surface descriptor set.
2. The Observation pane opened into the current universe and preset, filled its NGN pane at the intended presentation geometry, and retained visible controls.
3. The pane showed no return controls, stayed inert to background clicks, and did not black out the console or change `view.observation`.
4. The seven presentation targets converged across console and pane with advancing `stateRevision`.
5. Reload and close/reopen returned the pane to current state without participant-count ratcheting.
6. WATCH EXPERIENCE affected only the console overlay; the separate Observation pane remained independent.
7. The Observation frame remained non-authoritative: no WebLLM/Kokoro activity, `window.generativeExperience`, or `AudioContext` was created there.
8. Transient activity events appeared on console and pane at the same moment; disconnect/reconnect gave clean pane release and rediscovery; standalone two-window attachment (`index.html?surface=observation&xi=<real id>` with no NGN present) mirrored correctly; and the orphan URL (`?surface=observation&xi=nonexistent`) showed the inert waiting state and created no local authority.
Also outstanding, by design and outside Step 6.7:
The console's existing 16:9-lock checkbox behavior is pre-existing presentation
behavior, not a Contract 5.3 or Observation-surface authority defect. The
accepted embedding correction is deliberately scoped to prevent that console
overlay behavior from escaping into the embedded NGN pane.
- Step 6.8 has not been started.
- SciFi-XZBT's working tree remains uncommitted (its contract work, including
the adapter correction, is untracked in that repository); the packaged
artifact therefore reflects an uncommitted tree. A decision on committing
that repository is pending.
- The retained pre-6.7B artifact `dist/SciFiAmbientDisplay_Va723f46=1.html`
should not be distributed.
Acceptance above is not gated on §10: none of the deferred items bear on
Contract 5.3 compliance, surface authority, or the correction this report
closes.
## 10. Deferred operator verification (non-blocking)
Four checks from the 6.7B report §15 acceptance procedure call for sustained
human observation (audio quality, felt timing) rather than a scripted pass/fail,
and were not exercised in this pass. They do not block Contract 5.3 acceptance
above and are tracked here to be performed separately by an operator:
1. **Packaged single-file/offline behavior** — open the packaged `dist/`
artifact directly (`file://`, no server) and interact with it directly:
hotkeys, WATCH EXPERIENCE, and audio playback (report §15, steps 11 and 14).
Only the packaged boot and structural inlining were verified in this pass
(§4); direct offline interaction was not.
2. **Audible sound duplication/quality** — with the Observation pane open
alongside the console, confirm audio is not audibly duplicated between the
two and that playback quality is unaffected by the pane's presence.
3. **Generated AI announcement timing** — confirm AI-generated announcements
remain acceptably timed (not delayed or overlapping) as they appear on both
console and pane (report §15, step 9 covered simultaneity; felt timing
quality was not separately assessed).
4. **Longer-running ambient-event coexistence** — over a longer session than
this pass exercised, confirm ambient/transient events continue to
coexist correctly across console and pane without drift, duplication, or
missed events.
*(Note: Step 6.8 was subsequently completed and accepted with an unreproduced
session renegotiation tracked as non-blocking follow-up; Step 6 is closed at
Step 6.10.)* The retained pre-6.7B artifact
`dist/SciFiAmbientDisplay_Va723f46=1.html` should not be distributed.
docs/reference/XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md
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@@ -219,4 +219,6 @@ green (154/154); the packaged single-file build has been regenerated and
verified (fixture-consistent, structurally and behaviorally checked). See the
[Step 6.7 closure report](XZBT-NGN-Step6.7-Closure-Report.md). What remains
before Step 6.7 can be marked complete is the live NGN Observation
verification in report §15, steps 1–13.
verification in report §15, steps 1–13. *(Subsequent update: live verification
subsequently passed, Step 6.8 was completed and accepted, and Step 6 is closed
at Step 6.10; see the [Step 6.10 closure report](XZBT-NGN-Step6.10-Closure-Report.md).)*