§22 M3 frontend: /p/<project>/ routing, runtime branding, directory, 308s (v0.35.0)

Implements the M3-frontend slice of the §22 multi-project track, per
docs/superpowers/specs/2026-06-03-m3-frontend-design.md (design merged in
#10). Completes the runtime-config cut 0.33.0 (M3-backend Plan A) began.

Frontend:
- DeploymentProvider boots GET /api/deployment → {name, tagline,
  defaultProjectId, projects}; brandTitle() neutral 'RFC' pre-fetch fallback.
- /p/:projectId/* routing with generic /e/<slug> segment. ProjectLayout
  fetches /api/projects/:id, applies per-project theme (reset on switch),
  provides ProjectContext, guards the corpus (served only for the default;
  others get NotServedPlaceholder — decouples this slice from Plan B).
- Directory at / (2+ projects) with N=1 redirect into the single project;
  ProjectSwitcher in deployment chrome; entry-noun by project type.
- VITE_APP_NAME hard cut: removed from vite.config + index.html; the 6 brand
  reads now use deployment.name via context; static <title>RFC</title> + JS
  document.title. Internal /rfc·/proposals links → /p/<project>/e|proposals
  via lib/entryPaths.

Backend:
- GET /api/deployment returns default_project_id (the guard contract).
- Server-side 308s: /rfc/<slug>, /rfc/<slug>/pr/<n>, /proposals/<n> →
  /p/<default>/… . nginx (testing + prod) routes /rfc/ and /proposals/ to
  the backend.

Tests: 3 new backend redirect/deployment tests (438 pass); Vitest unit for
DeploymentProvider, ProjectLayout (theme/guard/404), Directory (11 pass);
clean build with no VITE_APP_NAME. Playwright e2e deferred until Tier-1 seeds
a registry (see CHANGELOG 0.35.0 step 5).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/BetaPending.jsx

@@ -12,17 +12,21 @@
 // ask-the-operator line.
 
 import { Link } from 'react-router-dom'
+import { useDeployment } from '../context/DeploymentProvider'
+import { brandTitle } from '../lib/brand'
 
 export default function BetaPending({ viewer }) {
   const contact = import.meta.env.VITE_BETA_CONTACT || ''
   const isPending = viewer?.permission_state === 'pending'
+  // §22.9: deployment name from runtime config (was VITE_APP_NAME).
+  const { name } = useDeployment()
   return (
     <div className="beta-pending">
       <div className="beta-pending-inner">
         <h1>
           {isPending
             ? 'Your request is in review.'
-            : `${import.meta.env.VITE_APP_NAME} is in private Beta.`}
+            : `${brandTitle(name)} is in private Beta.`}
         </h1>
         {isPending ? (
           <>