Release 0.15.0: Amplitude analytics (cookie-consent gated)

Roadmap item #13. Ships the frontend Amplitude SDK behind the v0.13.0
cookie/privacy consent gate. The analytics wrapper lives at
`frontend/src/lib/analytics.js` and exposes `track`, `identify`, and
`anonymize` over a stable nine-event taxonomy (Page Viewed, RFC
Viewed, User Signed In / Signed Out, RFC Proposed, PR Opened, Comment
Posted, Beta Access Requested, Admin Permission Decision). The
wrapper reads consent via `getConsent()` / `onConsentChange()` from
`frontend/src/lib/consent.js` (v0.13.0); the SDK module is
dynamically `import()`-ed only after `consent.analytics === true`,
and a later granted→denied flip calls `setOptOut(true)` so events
stop without a page reload. The Amplitude API key is read from
`VITE_AMPLITUDE_API_KEY` at build time; when unset the wrapper logs
one console warning and no-ops so dev environments keep working.

Wired into App.jsx (route-change Page Viewed + sign-in identify +
sign-out anonymize), Login.jsx (User Signed In with method =
otc/passcode/trust-device, Beta Access Requested on capture-profile
submit), ProposeModal.jsx (RFC Proposed), RFCView.jsx (RFC Viewed),
PRModal.jsx (PR Opened), RFCDiscussionPanel.jsx (Comment Posted with
surface=discussion), PRView.jsx (Comment Posted with surface=pr),
Admin.jsx (Admin Permission Decision with action=grant/revoke).
Event bodies carry only ids and enums — no titles, no comment
bodies, no names, no emails. The user binding passes only
`String(viewer.id)`.

Secret-vs-overlay binding caveat: Amplitude browser API keys are
visible in the shipped bundle via dev tools. Per the roadmap, the
key is still bound through `flotilla secret set` (rather than
`flotilla overlay set`) to keep all-keys-in-Secret-Manager
regularity for the OHM deployment; the CHANGELOG documents the
choice. Operator pre-deploy gesture (in the Upgrade steps block):
`pbpaste | ... ohm-rfc-app-flotilla secret set ohm-rfc-app
AMPLITUDE_API_KEY` — the wave-paused step before this release can
deploy.

No backend events ship in this release (Amplitude SaaS holds the
events); no schema migration; backend is unchanged. Migration slot
015 remains unused and available for the next minor that needs a
schema bump. New dependency: `@amplitude/analytics-browser`.
`VITE_AMPLITUDE_API_KEY` documented in `frontend/.env.example` with
the binding-choice caveat.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/RFCView.jsx

@@ -44,6 +44,7 @@ import ChangePanel, { diffWords } from './ChangePanel.jsx'
 import PRModal from './PRModal.jsx'
 import GraduateDialog from './GraduateDialog.jsx'
 import { claimOwnership } from '../api'
+import { EVENTS, track } from '../lib/analytics'
 
 const MANUAL_IDLE_MS = 5 * 60 * 1000   // §8.6 idle window; exact value is impl detail.
 const MANUAL_DEBOUNCE_MS = 800
@@ -121,7 +122,15 @@ export default function RFCView({ viewer }) {
   const [drawerOpen, setDrawerOpen] = useState(false)
 
   useEffect(() => {
-    getRFC(slug).then(setEntry).catch(err => setError(err.message))
+    getRFC(slug).then(entry => {
+      setEntry(entry)
+      // v0.15.0 — analytics: fire RFC Viewed once per slug load.
+      // We key on the slug param rather than the loaded entry so a
+      // re-render doesn't double-fire; the slug is the stable
+      // identifier. id is included for join-friendliness in the
+      // Amplitude dashboard.
+      track(EVENTS.RFC_VIEWED, { rfc_slug: slug, rfc_id: entry?.id })
+    }).catch(err => setError(err.message))
     listModels(slug)
       .then(({ models, default: def }) => {
         setModels(models || [])