docs: close Step 6 with reconciled Contract 5.3 evidence

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=<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.