docs(ui): record the 2026-10-30 browser sweep against coverage notes

Marks the sweep-candidate list as executed (every knob driven in a real
browser), preserves the four defect classes the sweep fixed so the next
agent does not re-learn them the hard way, and pins the panel-vs-
Playwright limitation (value assignment without change events) that any
future automated spec of the htmx-triggered controls must work around.

tests/ui/COVERAGE.md

@@ -71,3 +71,24 @@ New controls the Playwright sweep should cover once it lands:
   collection page.
 - API-level pins live in `TestPodcastEpisodeCollections` (7 subtests
   incl. the family-lens auditor case) + `TestPodcastPlayerOrderControl`.
+
+## 2026-10-30 — browser sweep executed (manual, OpenChamber panel)
+
+All controls above plus the item-3 builder/editor surfaces were driven
+in a real browser against the dev stack. Outcomes + reusable gotchas:
+
+- Fixed during the sweep: templ has no `continue` STATEMENT (codegen
+  emits it as literal text — the library switcher's podcast exclusion
+  never worked); CSP attribute grammar (no backticks, no `?.`, no
+  if-statements in Alpine attrs); rules editor double-encoded payloads;
+  store hook must use the IMPORTED Alpine (window.Alpine?.store silently
+  no-ops). Pins: TestLibrarySwitcherExcludesPodcasts, templates CSP
+  source scan, TestPodcastEpisodeCollections/TestEpisodeCollectionsFilterTree.
+- Panel limitation for future automated specs: `selectOption`-equivalent
+  via this panel sets the value WITHOUT a change event — htmx
+  change-triggers (player order dropdown, library switcher) must be
+  driven with Playwright-native interactions, not value assignment.
+- Episode flows confirmed: picker Episodes tab → Add Selected → cards
+  with queue=collection: play links → chain hops keep the param; order
+  controls appear ONLY in feed mode (player + feed page share the
+  persisted override).