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179 lines
12 KiB
Markdown
# XZBT-NGN Step 6.10 — Completion and Closure Report
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**Date:** 2026-09-15
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**Status:** STEP 6 COMPLETE WITH DOCUMENTED NON-BLOCKING FOLLOW-UP
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**Technical Baseline:** 163de264388f1e411cf9e54f26f72a254888afd (contract-5.3-accepted-baseline)
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**Closure Tag:** step-6-complete
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---
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## 1. Executive Summary and Closure Disposition
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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**.
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All required Step 6 implementation, adaptation, integration, and verification tasks are finished. No further Step 6 implementation work remains.
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The accepted technical baseline for Contract 5.3 multi-surface architecture is frozen at:
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* **Commit:** 163de264388f1e411cf9e54f26f72a254888afd
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* **Tag:** contract-5.3-accepted-baseline
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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.
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---
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## 2. Milestone Dispositions
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All Step 6 milestones have reached final adjudication and acceptance:
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| Milestone | Disposition | Notes |
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| **Step 6.1** | Complete | Multi-surface architectural model defined and documented (XZBT-Multi-Surface-Model-Step6.1.md). |
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| **Step 6.2** | Complete | Multi-surface reference prototype validated against Museum Gallery. |
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| **Step 6.3** | Complete | Surface discovery protocol and catalog validation implemented and verified. |
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| **Step 6.4** | Complete | Local presentation panes integrated into NGN operator UI without additional contract sessions. |
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| **Step 6.5** | **Satisfied by existing implementation and later evidence** | Multi-surface state synchronization proof adjudicated satisfied (see §3). |
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| **Step 6.6** | Complete and accepted | Reference exhibits validated under Contract 5.3. |
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| **Step 6.7** | Complete and accepted | SciFi-XZBT Observation surface adapted, packaged build verified, live 8-point verification passed. |
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| **Step 6.8** | **Complete and accepted** | Multi-surface behavior against SciFi-XZBT validated; single unreproduced renegotiation noted as follow-up (see §4). |
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| **Step 6.9** | **Complete** | Architectural and protocol conformance review passed across all 18 review areas (see §5). |
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| **Step 6.95** | **Complete** | Verification evidence and cross-document references reconciled. |
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| **Step 6.10** | **Complete** | Formal completion gate passed: Step 6 closed. |
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---
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## 3. Step 6.5 Adjudication: Synchronization Proof
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Step 6.5 was adjudicated by the Step 6.10 completion gate as:
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> **SATISFIED BY EXISTING IMPLEMENTATION AND LATER EVIDENCE**
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The requirement for shared-state synchronization across surfaces was satisfied by the verified architecture and evidence rather than requiring a hypothetical multi-host topology:
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1. **Authoritative Exhibit State Core:** A single state core maintains all authoritative exhibit state, revision counters (stateRevision), and mutation dispatch.
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2. **Snapshot and Revision on Attachment:** When a secondary surface attaches, it immediately receives a full immutable state snapshot stamped with the current stateRevision.
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3. **Ongoing State and Event Propagation:** Owner-mediated mutations and events broadcast monotonically to all attached surfaces.
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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).
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5. **Clean Detach and Reopen Lifecycle:** Detaching and reattaching surfaces preserves monotonic participant counts without ratcheting or state corruption.
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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).
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No requirement exists or was ever specified for multiple NGN instances controlling a single exhibit.
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---
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## 4. Step 6.8 Completion and Accepted Status
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Step 6.8 (multi-surface behavior against SciFi-XZBT) is **complete and accepted**.
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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.
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### Residual Observation (Non-Blocking Follow-Up)
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During live multi-surface testing in Step 6.8, one session renegotiation was observed once. This event:
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* could not be reproduced under repeated testing,
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* had no architectural defect or protocol violation identified,
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* preserved exhibit state throughout,
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* recovered cleanly without operator intervention, and
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* remains documented as a non-blocking follow-up observation.
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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.
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---
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## 5. Architectural Review and Invariants (Step 6.9 Summary)
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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.
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### Core Architectural Conclusions
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* **Generic NGN Core:** The NGN host core (src/**) contains zero exhibit-specific or SciFi-specific code. All controls and surfaces are descriptor-driven.
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* **Exhibit-Scoped Semantics:** All exhibit-specific logic (e.g. Starship visualizer, LCARD interface, Kokoro TTS, WebLLM) resides exclusively within exhibit and fixture code.
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* **Single-Owner Authority:** All mutations flow through a single chokepoint (ExhibitHost.request()). Surfaces cannot establish independent contract sessions or bypass owner authority.
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* **Non-Authoritative Surfaces:** Presentation surfaces are purely observational/presentational; they have no host transport or session authority.
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* **Monotonic State Convergence:** State snapshots and revisions (stateRevision) advance monotonically; late-joining and reconnected surfaces converge immediately to current state.
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* **Session Identity Protection:** Out-of-session and stale messages are rejected by session ID gating.
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* **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.
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* **Presentation and Surface Lifecycle Separation:** Opening an Observation surface does not alter the console overlay flag ( iew.observation), maintaining distinct lifecycles.
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* **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.
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* **Contract 5.3 Coherence:** Full Contract 5.3 conformance is maintained with verified backward compatibility for Contract 5.2 exhibits.
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* **Test Verification:** All 154 automated tests and all 24 focused SciFi surface tests pass cleanly.
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* **No Blocking Defects:** No blocking architectural defect was found.
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### Verified Architectural Invariants
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| Invariant | Status | Evidence |
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| 1. Single authority for mutations | **VERIFIED** | All mutations route through ExhibitHost.request() and exhibit owner |
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| 2. State immutability & revision tracking | **VERIFIED** | Snapshots are immutable; revisions advance monotonically |
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| 3. Exhibit-generic NGN core | **VERIFIED** | Zero exhibit-specific code in src/** |
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| 4. Surface presentation-only semantics | **VERIFIED** | Surfaces have no host transport, session authority, or mutation rights |
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| 5. Same-origin security boundary | **VERIFIED** | Same-origin enforced across frames, URLs, and postMessage transports |
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| 6. Contract 5.3 conformance | **VERIFIED** | All 12 Contract 5.3 conformance requirements satisfied |
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| 7. Backward compatibility with 5.2 | **VERIFIED** | Contract 5.2 exhibits negotiate and function without regression |
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| 8. Error isolation and recovery | **VERIFIED** | Surface-level errors stay within the pane; host session remains healthy |
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| 9. Descriptor-driven rendering | **VERIFIED** | UI dynamically renders targets advertised in describe catalog |
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| 10. Graceful degradation | **VERIFIED** | Invalid descriptors are safely discarded while valid entries are preserved |
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| 11. Presentation/surface lifecycle independence | **VERIFIED** | Surface open/close does not toggle console overlay state |
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| 12. Session identity & orphan fail-closed | **VERIFIED** | Stale traffic is rejected; orphaned surfaces remain inert |
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---
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## 6. Verification Evidence Summary
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The technical baseline 163de2 is verified by the following test and live browser evidence:
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* **Full Automated Test Suite:** **154 / 154** tests passing (
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pm test /
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ode --test).
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- Connection and URL validation: 8 tests
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- Host negotiation and state management: 32 tests
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- Surface discovery and descriptor validation: 44 tests
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- Local surface frame lifecycle: 20 tests
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- PostMessage transport interop: 7 tests
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- Reference exhibit integration: 43 tests
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* **Focused SciFi Observation Surface Suite:** **24 / 24** tests passing (
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ode --test tests/scifi-surfaces.test.js).
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* **Live Museum Gallery Evidence:** Multi-surface presentation validated in live browser sessions (Step 6.2 and Step 6.6).
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* **Live SciFi-XZBT 8-Point Verification:** Passed all eight live criteria:
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1. Connected and synchronized as Contract 5.3 with two-surface descriptor catalog.
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2. Observation pane opened with correct geometry and visible controls.
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3. Observation pane showed no return controls, remained inert to background clicks, and did not alter console state.
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4. Presentation targets converged across console and pane with advancing stateRevision.
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5. Reload and close/reopen returned pane to current state without participant ratcheting.
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6. Console WATCH EXPERIENCE affected only console overlay, leaving the Observation pane independent.
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7. Observation frame instantiated no WebLLM, Kokoro, or AudioContext.
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8. Transient events appeared simultaneously; disconnect/reconnect gave clean pane release and rediscovery; orphan URL presented inert waiting state without authority.
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* **Packaging Verification:** Regenerated single-file standalone artifact verified for structural inlining (13 assets inlined, zero external references) and valid served-path handshake.
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---
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## 7. Blocking Items
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**None.** There are no unresolved blocking defects, contract violations, or outstanding architectural blockers for Step 6.
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---
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## 8. Documented Non-Blocking Follow-Up Items
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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:
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1. **Unreproduced Session Renegotiation:**
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The single unreproduced session renegotiation observed during Step 6.8 testing remains tracked for ongoing observation.
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2. **Packaged Offline Direct Interaction:**
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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).
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3. **Audible Sound Duplication and Quality:**
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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.
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4. **Generated AI Announcement Timing:**
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Subjective timing quality and cadence of local AI-generated voice announcements appearing across surfaces requires sustained operator listening.
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5. **Long-Running Ambient-Event Coexistence:**
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Observation over an extended multi-hour session to confirm that ambient visual and audio events coexist without drift or missed events.
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None of these items are represented as passed; they remain open, documented non-blocking follow-up observations.
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---
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## 9. Final Conclusion
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Step 6 has satisfied all requirements of the Contract 5.3 multi-surface milestone. No further implementation work is required for Step 6.
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XZBT-NGN Step 6 is formally closed at tag step-6-complete on top of accepted technical baseline 163de264388f1e411cf9e54f26f72a254888afd.
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