feat: add command center chat loop widget

packages/casan-control-panel/backend/test/telemetry.test.ts

@@ -5,7 +5,7 @@ import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { readJsonl, readJson, readHead } from '../src/telemetry/telemetry.reader.js';
 import { APP_ROOT, PATHS, isStale, metricsAgeSeconds } from '../src/common/app-root.js';
-import { TelemetryService } from '../src/telemetry/telemetry.service.js';
+import { TelemetryService, buildChatLoopWidget } from '../src/telemetry/telemetry.service.js';
 
 test('readJsonl parses valid lines and skips malformed', () => {
   const d = mkdtempSync(join(tmpdir(), 'cp-'));
@@ -53,6 +53,7 @@ test('commandCenter() returns evidence-backed widget contract', () => {
   const ids = Object.keys(command.widgets);
   assert.deepEqual(ids.sort(), [
     'certification',
+    'chat_loop',
     'finops',
     'hitl',
     'kill_switch',
@@ -71,6 +72,53 @@ test('commandCenter() returns evidence-backed widget contract', () => {
   assert.ok(Array.isArray(command.ticker));
 });
 
+test('buildChatLoopWidget summarizes chat replay fixture and evidence', () => {
+  const d = mkdtempSync(join(tmpdir(), 'cp-chat-'));
+  const auditPath = join(d, 'chat-turns.jsonl');
+  writeFileSync(auditPath, '{"seq":1}\n{"seq":2}\n');
+  const prevBudget = process.env.CASAN_CHAT_TOKEN_BUDGET;
+  process.env.CASAN_CHAT_TOKEN_BUDGET = '200';
+  try {
+    const widget = buildChatLoopWidget(
+      [
+        { seq: 1, timestamp: '2026-07-08T00:00:00Z', chat_id: 'chat1', turn_id: 't1', mode: 'READ_ONLY', decision: 'ANSWERED' },
+        {
+          seq: 2,
+          timestamp: '2026-07-08T00:01:00Z',
+          chat_id: 'chat1',
+          turn_id: 't2',
+          mode: 'OPERATOR',
+          decision: 'ACTION_COMPLETED',
+          loop_run: { run_id: 'loop1', decision: 'CERTIFIED' },
+          record_hash: 'abc123',
+        },
+      ],
+      [
+        { agent: 'chat.ask-casan', step: 'ask-casan-readonly', total_tokens: 40 },
+        { agent: 'chat.operator', step: 'operator:generate_report', total_tokens: 60 },
+        { agent: 'planner', step: 'unrelated', total_tokens: 900 },
+      ],
+      auditPath,
+      { ok: true, decision: 'MATCH', records: 2, loop_replayed: 1, diffs: [], audit_path: auditPath },
+    ) as any;
+
+    assert.equal(widget.id, 'chat_loop');
+    assert.equal(widget.status, 'ok');
+    assert.equal(widget.metrics.turns, 2);
+    assert.equal(widget.metrics.answered, 1);
+    assert.equal(widget.metrics.action_completed, 1);
+    assert.equal(widget.metrics.loop_runs, 1);
+    assert.equal(widget.metrics.replay_loop_replayed, 1);
+    assert.equal(widget.metrics.budget_used_pct, 50);
+    assert.equal(widget.envelope.verified, true);
+    assert.equal(widget.evidence.latest_turn.loop_run.run_id, 'loop1');
+    assert.equal(widget.evidence.replay.decision, 'MATCH');
+  } finally {
+    if (prevBudget === undefined) delete process.env.CASAN_CHAT_TOKEN_BUDGET;
+    else process.env.CASAN_CHAT_TOKEN_BUDGET = prevBudget;
+  }
+});
+
 test('freshness helpers behave (age is number|null, isStale is boolean)', () => {
   const age = metricsAgeSeconds();
   assert.ok(age === null || typeof age === 'number');