feat(ui): Sentinel view — Yerin global security chat

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/views/sentinel.js

@@ -0,0 +1,25 @@
+// #/sentinel — Yerin's global, read-only security view. Uses the shared
+// agent_chat panel pointed at /api/security/yerin (no draft cards).
+import { el, mount } from '../dom.js';
+import { wireAgentChat } from '../components/agent_chat.js';
+
+const YERIN_LABELS = {
+  audit_log: '🗒️ reading the audit trail', agent_inventory: '👁️ reviewing agents',
+  pending_review: '⏳ checking the approval queue', resource_exposure: '🛡️ checking exposure',
+  token_audit: '🔑 auditing tokens'
+};
+
+export async function render(main) {
+  const log = el('div', { class: 'rail-log sentinel-log' });
+  const input = el('textarea', { class: 'rail-input', rows: 1, placeholder: 'Ask Yerin about the Void’s security…' });
+  mount(main,
+    el('h1', { class: 'view-h1' }, '◆ Sentinel — Yerin'),
+    el('p', { class: 'view-sub' }, 'Read-only security & observability. She watches, reports, and warns — she never acts.'),
+    el('div', { class: 'sentinel-chat' }, log, el('div', { class: 'rail-inputwrap' }, input)));
+  const chat = wireAgentChat({
+    logEl: log, inputEl: input,
+    historyUrl: '/api/security/yerin', turnUrl: '/api/security/yerin/turn',
+    agentName: 'Yerin', showDrafts: false, toolLabels: YERIN_LABELS
+  });
+  await chat.load();
+}