Slice 7: §14 chrome + settings and admin neighborhoods

§14.1 richer landing, §14.2 /philosophy route (disk-backed), §14.3
persistent About link. /settings/notifications surfaces Slice 6's
preferences/quiet-hours/mute/watches endpoints. /admin home base
consolidates role management, the §6.2 write-mute, the audit-log
viewer, the permission-events log, and the §13.2 graduation queue.

Backend: backend/app/philosophy.py, backend/app/api_admin.py (seven
admin endpoints + user-search), GET /api/users/me/notification-mutes.
Frontend: Landing.jsx (deck), Philosophy.jsx, NotificationSettings.jsx,
Admin.jsx, App.jsx routing for the chrome surfaces.

Tests: backend/tests/test_chrome_vertical.py — 13 cases. Full suite
75/75 green.

Spec corrections: §14.2 (PHILOSOPHY.md source is a deployment-time
decision), §17 (admin block extended to name the seven new endpoints
+ user-search and notification-mutes read). §19.1 rewritten for
Slice 8 hardening; §19.2 grew four candidates (owner succession,
mute-from-actor, the "Following since <date>" disclosure, audit-log
row prose).

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

frontend/src/api.js

@@ -478,6 +478,68 @@ export async function advanceChatSeen(slug, branch, lastSeenMessageId) {
   }))
 }
 
+// ---------------------------------------------------------------------------
+// §14.2 / Slice 7: PHILOSOPHY.md surface
+// ---------------------------------------------------------------------------
+
+export async function getPhilosophy() {
+  return jsonOrThrow(await fetch('/api/philosophy'))
+}
+
+// ---------------------------------------------------------------------------
+// Slice 7: admin neighborhood (§17 admin/* + user search for the §15.8 mute
+// typeahead).
+// ---------------------------------------------------------------------------
+
+export async function listAdminUsers() {
+  return jsonOrThrow(await fetch('/api/admin/users'))
+}
+
+export async function setUserRole(userId, role) {
+  return jsonOrThrow(await fetch(`/api/admin/users/${userId}/role`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ role }),
+  }))
+}
+
+export async function setUserMute(userId, muted) {
+  return jsonOrThrow(await fetch(`/api/admin/users/${userId}/mute`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ muted }),
+  }))
+}
+
+export async function listAuditLog({ actionKind, actorUserId, rfcSlug, beforeId, limit } = {}) {
+  const params = new URLSearchParams()
+  if (actionKind) params.set('action_kind', actionKind)
+  if (actorUserId != null) params.set('actor_user_id', actorUserId)
+  if (rfcSlug) params.set('rfc_slug', rfcSlug)
+  if (beforeId != null) params.set('before_id', beforeId)
+  if (limit != null) params.set('limit', limit)
+  const qs = params.toString()
+  return jsonOrThrow(await fetch(`/api/admin/audit${qs ? `?${qs}` : ''}`))
+}
+
+export async function listPermissionEvents({ beforeId, limit } = {}) {
+  const params = new URLSearchParams()
+  if (beforeId != null) params.set('before_id', beforeId)
+  if (limit != null) params.set('limit', limit)
+  const qs = params.toString()
+  return jsonOrThrow(await fetch(`/api/admin/permission-events${qs ? `?${qs}` : ''}`))
+}
+
+export async function listGraduationQueue() {
+  return jsonOrThrow(await fetch('/api/admin/graduation-queue'))
+}
+
+export async function searchUsers(q) {
+  const params = new URLSearchParams()
+  if (q) params.set('q', q)
+  return jsonOrThrow(await fetch(`/api/users/search?${params}`))
+}
+
 // SSE subscription helper. Returns a close() function. The handler
 // surface mirrors §15.3: a snapshot event on open, then per-notification
 // `notification` events, plus `read` events when another tab marks a row.