fix(webui): remediate PR #856 REQUEST_CHANGES for policy visibility (#646)

Address review blockers (review #555):
- Graduate /policy nav item out of STUB_PAGES to live nav in webui/nav.py
- Update docs/webui-local-dev.md to list /policy as a live surface and remove stub copy
- Run console_redaction on HTML emit path in webui/policy_views.py before rendering HTML
- Add planted-secret HTML redaction test and nav graduation test in tests/test_webui_policy_visibility.py

docs/webui-local-dev.md

@@ -80,7 +80,6 @@ status, onboarding checklist state, and the fail-closed error payloads (#635).
 | `/sessions` | Phase 1 shell stub — session inventory (backed by #636) |
 | `/inventory` | Phase 1 shell stub — unified inventory (backed by #636) |
 | `/timeline` | Phase 1 shell stub — workflow event timeline |
-| `/policy` | Phase 1 shell stub — capability/role policy placeholder |
 | `/insights` | Phase 1 shell stub — operational insights placeholder |
 
 Most routes are GET-only. POST/PUT/PATCH/DELETE return `405` with
@@ -259,7 +258,7 @@ The view never edits policy and exposes no gate-weakening toggle.
 The console shell (`webui/layout.py`) renders a grouped navigation driven by a
 single nav-config module, `webui/nav.py`. Nav groups follow the epic #631
 Phase 1 information architecture: **Health, Traffic, Runtime/Sessions,
-Projects, Inventory, Timeline, Policy** (placeholder), and **Insights**
+Projects, Inventory, Timeline, Policy, and Insights**
 (placeholder). Live views and Phase 1 placeholders (`stub`) are declared in one
 place so the layout and the route table cannot drift.
 
@@ -269,7 +268,7 @@ a **mode: read-only** badge — plus a **Docs** link to this document. No
 privileged action controls are present in the Phase 1 shell.
 
 Not-yet-implemented surfaces (`/sessions`, `/inventory`, `/timeline`,
-`/policy`, `/insights`) resolve to graceful read-only stub pages instead of
+`/insights`) resolve to graceful read-only stub pages instead of
 404s; their backing views land in later child issues of #631 (the inventory
 surfaces are backed by #636). Mutating methods on stub routes still fail closed
 with `read-only-mvp`.