diff --git a/README.md b/README.md index 1a06421..e505eca 100644 --- a/README.md +++ b/README.md @@ -13,9 +13,12 @@ pass. Haunted House reports conformant values, and publishing validation passes. Steps 6.1–6.3 established Contract 5.3 surface discovery and interoperability. Step 6.4 adds local presentation panes; see the [Step 6.4 report](docs/architecture/XZBT-NGN-Step6.4-Local-Surfaces.md). -Step 6.6 validates the reference exhibits, and Step 6.7 adds the SciFi-XZBT -Observation surface, including regenerated packaged-build verification; live -NGN Observation verification remains outstanding — see the +Step 6.5 synchronization is satisfied by existing implementation and later evidence. +Step 6.6 validates reference exhibits, Step 6.7 adds the SciFi-XZBT Observation +surface, and Step 6.8 validates multi-surface behavior. Step 6 is complete with +documented non-blocking follow-up at the Contract 5.3 accepted baseline `f163de2` +and closed at tag `step-6-complete` — see the +[Step 6.10 closure report](docs/reference/XZBT-NGN-Step6.10-Closure-Report.md) and [Step 6.7 closure report](docs/reference/XZBT-NGN-Step6.7-Closure-Report.md). ## Run locally @@ -127,9 +130,12 @@ discovery and local rendering (Section 31) are implemented and exercised by the Museum Gallery reference exhibit, and the SciFi-XZBT reference exhibit declares a console surface plus an Observation surface (Step 6.7B); the other maintained exhibits do not declare multiple surfaces. Surface errors stay within the -affected pane. Remote/cast display assignment remains deferred. Shared-state -synchronization proof remains Step 6.5; this step adds no host-side surface -communication. +affected pane. Remote/cast display assignment remains deferred. Multi-surface +state synchronization (Step 6.5) is satisfied by the single-authority state +core, snapshot/revision attachment, and owner-mediated mutation routing proven +across reference exhibits. Step 6.8 multi-surface behavior is complete and +accepted, with a single unreproduced renegotiation noted as non-blocking +follow-up. Not implemented: casting/display endpoints, MIDI, MCP/webhooks, scenarios/recording, telemetry acquisition, multi-exhibit orchestration, diff --git a/docs/architecture/XZBT-NGN-Step6.4-Local-Surfaces.md b/docs/architecture/XZBT-NGN-Step6.4-Local-Surfaces.md index 4a6823f..74c5f1b 100644 --- a/docs/architecture/XZBT-NGN-Step6.4-Local-Surfaces.md +++ b/docs/architecture/XZBT-NGN-Step6.4-Local-Surfaces.md @@ -163,3 +163,6 @@ missing-page or timeout testing. architecture was introduced. All Step 6.4 acceptance categories pass. Step 6.5 has not been implemented. +*(Adjudication note: Step 6.5 was subsequently adjudicated as satisfied by existing +implementation and later evidence at the Step 6.10 completion gate; see the +[Step 6.10 closure report](../reference/XZBT-NGN-Step6.10-Closure-Report.md).)* diff --git a/docs/reference/XZBT-NGN-Step6.10-Closure-Report.md b/docs/reference/XZBT-NGN-Step6.10-Closure-Report.md new file mode 100644 index 0000000..18a189b --- /dev/null +++ b/docs/reference/XZBT-NGN-Step6.10-Closure-Report.md @@ -0,0 +1,178 @@ +# 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. diff --git a/docs/reference/XZBT-NGN-Step6.7-Closure-Report.md b/docs/reference/XZBT-NGN-Step6.7-Closure-Report.md index 93b48c5..b1d8eb7 100644 --- a/docs/reference/XZBT-NGN-Step6.7-Closure-Report.md +++ b/docs/reference/XZBT-NGN-Step6.7-Closure-Report.md @@ -1,10 +1,12 @@ # 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=` 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=` 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. diff --git a/docs/reference/XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md b/docs/reference/XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md index 6351115..8f5282d 100644 --- a/docs/reference/XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md +++ b/docs/reference/XZBT-NGN-Step6.7-SciFi-Surface-Adaptation.md @@ -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).)* diff --git a/test-fixtures/PROVENANCE.md b/test-fixtures/PROVENANCE.md index 720bc86..31ee949 100644 --- a/test-fixtures/PROVENANCE.md +++ b/test-fixtures/PROVENANCE.md @@ -156,3 +156,30 @@ Verification of the regenerated artifact (raw output in `e.origin` as `"null"` for `file://` documents while `window.location.origin` is `file://`). That is the adapter's designed same-origin/self safety filter, not a defect; NGN attaches exhibits over `http://` only. + +## Accepted Contract 5.3 baseline (2026-09-15) + +`f163de264388f1e411cf9e54f26f72a254888afd` is the accepted Contract 5.3 +baseline, marked by the annotated tag `contract-5.3-accepted-baseline`. +The NGN full suite passed **154/154**, and the SciFi Observation surface smoke +suite passed **24/24**. The final live eight-point NGN verification also passed, +including pane geometry, synchronized presentation state, lifecycle handling, +console-only heavy subsystems, standalone attachment, and the inert orphan +waiting state. + +This baseline adds two fixture-local integration corrections after the earlier +source-to-fixture resync: `css/style.css` clears the console overlay's centered +16:9 geometry when Observation is embedded in an NGN pane, and `js/app.js` +presents an inert waiting state after an owner-attachment timeout. They do not +create a second authority or alter the upstream exhibit's contract behavior. + +The console's existing 16:9-lock checkbox behavior is pre-existing and +unrelated to these corrections. It remains console presentation behavior; the +embedded-surface override is intentionally limited to keeping that behavior +from affecting NGN pane geometry. + +Step 6.7 and Step 6.8 are complete and accepted, and Step 6.5 state synchronization +is satisfied by existing implementation and later evidence. Non-blocking operator +checks and the unreproduced session renegotiation observation are tracked +separately. Step 6 is closed at Step 6.10 (see +`docs/reference/XZBT-NGN-Step6.10-Closure-Report.md`).