feat(ui): ship reachability witnessing shell

docs/modules/ui/TASKS.md

@@ -9,7 +9,6 @@
 - `docs/implplan/SPRINT_20260307_009_DOCS_ui_component_preservation_map.md`
 - `docs/implplan/SPRINT_20260307_022_FE_policy_vex_release_decisioning_studio.md`
 - `docs/implplan/SPRINT_20260307_023_DOCS_ui_restoration_topic_shapes.md`
-- `docs/implplan/SPRINT_20260307_025_FE_reachability_witnessing_merge.md`
 - `docs/implplan/SPRINT_20260307_026_FE_platform_ops_consolidation.md`
 - `docs/implplan/SPRINT_20260307_027_FE_triage_explainability_workspace.md`
 - `docs/implplan/SPRINT_20260307_028_FE_workflow_visualization_replay.md`
@@ -77,12 +76,12 @@
 - [DONE] FE-WL-004 Tuning tab and operational diagnostics
 - [DONE] FE-WL-005 Cross-product surfacing and deep links for Watchlist
 - [DONE] FE-WL-006 QA, rollout, and docs sync for Watchlist
-- [TODO] FE-RW-001 Freeze reachability shell tabs and route contract
-- [TODO] FE-RW-002 Witnesses tab and witness-detail page slice
-- [TODO] FE-RW-003 PoE drawer and permalink route contract
-- [TODO] FE-RW-004 Cross-product deep links and release-context use for reachability proofs
-- [TODO] FE-RW-005 Supporting evidence and export surfaces for witness UX
-- [TODO] FE-RW-006 QA, rollout, and docs sync for reachability witnessing
+- [DONE] FE-RW-001 Freeze reachability shell tabs and route contract
+- [DONE] FE-RW-002 Witnesses tab and witness-detail page slice
+- [DONE] FE-RW-003 PoE drawer and permalink route contract
+- [DONE] FE-RW-004 Cross-product deep links and release-context use for reachability proofs
+- [DONE] FE-RW-005 Supporting evidence and export surfaces for witness UX
+- [DONE] FE-RW-006 QA, rollout, and docs sync for reachability witnessing
 - [TODO] FE-PO-001 Freeze Operations overview taxonomy and submenu structure
 - [TODO] FE-PO-002 Overview page regrouping and blocking-card contract
 - [TODO] FE-PO-003 Legacy widget absorption matrix for Platform Ops