docs(devlog): add missing devlog entries for Steps 5, 6.3, and Step 6 completion

2026-09-15 11:57:56 -07:00
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+_model: devlog-entry
+---
+schema_version: 1
+---
+title: Contract 5.3 Accepted Technical Baseline
+---
+date: 2026-09-15
+---
+author: cgcha
+---
+summary: Established the accepted Contract 5.3 multi-surface technical baseline at f163de2, verified by 154 automated tests, SciFi surface smoke tests, and live browser verification.
+---
+tags: step6, contract-5-3, baseline, scifi-xzbt, multi-surface
+---
+source_commit: f163de264388f1e411cf9e54f26f72a254888afd
+---
+body: |
+  This devlog entry records the formal acceptance and freezing of the Contract 5.3 multi-surface technical baseline at commit 163de264388f1e411cf9e54f26f72a254888afd, marked by the annotated tag contract-5.3-accepted-baseline.
+
+  Following the integration of local presentation panes (Step 6.4) and the adaptation of the SciFi-XZBT Observation surface (Step 6.7), this milestone incorporates two key fixture-level presentation corrections:
+  1. Clearing centered 16:9 overlay geometry when the Observation surface is embedded inside an NGN host pane so that it fills its assigned presentation geometry cleanly.
+  2. Presenting an inert waiting state when an Observation surface is loaded without an active owner attachment, ensuring orphaned surfaces fail closed and never invent secondary authority.
+
+  Verification highlights:
+  - **Automated Suites:** The full automated test suite passes **154 / 154** tests, and the focused SciFi Observation surface smoke suite passes **24 / 24** tests.
+  - **Packaging:** Regenerated standalone single-file builds were verified for complete resource inlining and served-path handshake execution.
+  - **Live Browser Verification:** Passed the eight-point live browser acceptance procedure across pane geometry, target state convergence, clean reload/reopen lifecycle, console-only heavy subsystems (no WebLLM, Kokoro TTS, or AudioContext in surface frames), and orphan fail-closed behavior.