docs: queue plan 20A independent review

docs/execution/briefs/review-plan-20a.md

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+# Independent review: Plan 20A hidden-section recovery
+
+Review only in `/Users/amruth/orca/workspaces/reactive-resume/issue-3378-hidden-section-recovery` on branch
+`codex/issue-2921-hidden-section-recovery`. Exact target head:
+`0ec054df70e6f445557bd3a54a0d62686586b3de`. Do not edit tracked files, commit, push, publish, merge, or mutate issues.
+
+Read current repository instructions, pinned approved Plan 20, implementation report, full `origin/main...HEAD` diff,
+live issues #2921/#3378/#3265, open PR overlap, and builder/resume-domain guidance. Refresh base and verify exact head.
+Run root Intent inventory and load matching review skill if any; no subagents.
+
+Review Standards and Spec independently. Verify especially:
+
+- pure `getSectionAvailability` inventory covers all printable built-ins, Summary, and real custom sections while excluding
+  Picture, Basics, UI-only custom container, and unknown IDs; placement and hidden state remain independent; duplicate,
+  later-page, and sidebar locations work without mutating data;
+- compact recovery UI replaces full editor panels only for hidden printable sections; effective localized titles, custom
+  child behavior, navigation/focus, keyboard access, locked disablement, and undo/redo are correct;
+- Show changes only the existing hidden flag, preserving content, item order, and byte-equivalent layout arrays; an
+  unplaced hidden section remains unplaced and no 20B placement behavior appears;
+- custom-section editor container stays usable when only some custom children are hidden;
+- package export, ownership, named props, SSR, Lingui catalog/source handling, and accessibility follow repository rules;
+- tests are mutation-sensitive and authenticated E2E proves save/reload, compact entries, PDF absence/restoration, exact
+  authored layout preservation, undo/redo, locked state, and cleanup without accepting stale Saved state;
+- PR scope must reference #2921 only and must not claim recovery for #3378/#3265 or deleted content.
+
+Run focused resume/web tests plus relevant existing visibility/menu/navigation regressions, affected typechecks, boundaries,
+production build, narrow non-writing Biome, Lingui/diff/scope gates, and isolated authenticated E2E if practical. Report
+findings first with severity/anchors and publication verdict in `.orchestration/plan-20a-review.md`; send `worker_done`.