feat(ui): share one token-backed status notice

[seonghobae]

Outcome

• adds shared StatusNotice (success / unavailable / retry) as current-main ADR 0214, superseding closed-branch ADR 0134 for protected main only
• migrates Calendar's Naruon fail-closed path so missing projection copy and the next action sit in one named region
• keeps retry on role="alert" with Retry; success and unavailable stay a named region so App live-region uniqueness (getByRole("status")) holds
• distinguishes kinds by label and glyph, not color alone (ADR 0099 tokens); never interpolates provider payloads (ADR 0123)

Independent of open stacks #579, #629, #631, #632, #636, #639, #640. Tracks #611; the issue stays open until remaining 0133/0135/0136/0137 slices ship on current main.

Verification

• corepack pnpm lint (0 warnings, 0 errors)
• corepack pnpm test (388 passed)
• corepack pnpm exec vitest run src/App.test.tsx -t "fails closed on the calendar" (passed)
• corepack pnpm build
• uv run --extra dev pytest -q tests/test_documentation_hygiene.py (5 passed)

Synthetic fixtures only. No keyword, heuristic, arbitrary threshold, or local measurement weight is introduced.

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[seonghobae]

Exact-head UI audit: 041ec13b passed StatusNotice and WorkspaceCalendar component tests (8), lint, and Storybook build. The Unavailable scene was rendered and visually inspected at 1200×600 and 390×600: named state, message, and next action remain readable without horizontal overflow; the glyph plus visible label keeps state distinguishable without color alone. Screenshots used synthetic content and remain local, not committed.

[seonghobae]

Verified current head 041ec13 against ADR 0203: the unavailable branch intentionally renders the fail-closed notice before any event list, and the API contract returns events=[] when naruon_available=false. No actionable defect found in Devin note. Local Vitest: 9 targeted tests passed (StatusNotice, WorkspaceCalendar, Calendar App paths). Protected approval and hosted gates remain required.

[seonghobae]

Merged current protected-main base and retained both the StatusNotice and semantic-unit changelog entries. New exact head: 7fb4d18c69e18700229dbacb0690a891fb7b41ea. Hosted checks and independent review remain required.