Complete RC9 live UX acceptance

docs/CODEX_EXECUTION_LOG.md

@@ -10582,3 +10582,35 @@ Decision:
 
 - RC-8 is complete. RC-9 loading, accessibility and performance hardening is
   active.
+
+## 2026-07-18 - Belgium/North Sea RC-9 UX and performance acceptance
+
+Implemented:
+
+- Replaced transient false missing-source states with explicit bootstrap
+  loading and propagated loading/error state to the map and source panels.
+- Added keyboard-correct analysis tabs, reliable skip-link focus, accessible
+  map/status regions and stable focus handling across workspace changes.
+- Added measured four-second coverage and fifteen-second map-analysis budgets
+  with visible completion and over-budget feedback.
+- Hardened 390-pixel mobile, 1366-pixel desktop and 2560-pixel ultrawide
+  layouts without changing map-first behavior.
+- Added a Playwright UX audit for every workspace, accessible control names,
+  delayed bootstrap, keyboard behavior, layout overflow and timing feedback.
+
+Validation:
+
+- Repository readiness passed backend compilation, 1,015 backend tests,
+  16 frontend tests, frontend typecheck/build and Alembic head
+  `202607160001`.
+- Immutable image
+  `9b0239747d1f12d0c5dd3b7fa2d03cf672884dbd-ai` deployed healthy with
+  PostGIS 3.6 and the expected migration head.
+- The live UX audit passed at 390x844, 1366x768 and 2560x1080 with no
+  horizontal overflow, console errors or failed requests. All seven
+  workspaces passed accessible-name checks and the delayed-loading and
+  performance-feedback assertions were green.
+
+Decision:
+
+- RC-9 is complete. RC-10 data operations and retention is active.