feat: Reginald is real — model router + agent loop + query_project (P4)

The fixture chat panel is now a working agent. Ask Reginald a question and it
consults the real project through a tool loop, then answers in grounded prose.
Read-only v0 — writes still go through the propose-approve controls.

core (@commitea/core/agent):
- chat-client: OpenAI-wire chat completions over an injected fetch (same seam as
  gitea). Points at any OpenAI-compatible endpoint (LM Studio/Ollama/OpenAI).
- model-router: small model for prose + the read tool; big model reserved for
  later decomposition (pickModel).
- agent-loop: runAgentTurn drives call→tool→result→call until prose (or a step
  budget), recording each tool step. Injected complete + execute → fully testable.
- query-project: the single read tool's engine — compact focus/board/calibration/
  issue/search views built from scheduler + lifecycle + calibration; unbuilt views
  return a notImplemented marker (never fabricated). The model reports, never computes.
- agent-tools: query_project declaration + Reginald's system prompt.

app:
- main model bridge (model:status, model:chat) runs the loop; query_project
  reconciles the repo and builds the view. Model traffic stays in main (token/CSP).
  gitea.ts refactored to share getGiteaClient + reconcileSnapshot.
- preload + global.d.ts expose the model bridge; useChat drives the panel — real
  agent turn when a model is configured, scripted fixture reply otherwise (so
  fixture e2e is unchanged). A subtle "consulted the project" activity line.

Model config (env, defaults to LM Studio on :1234): COMMITEA_MODEL_URL /
_SMALL (google/gemma-4-e4b) / _BIG (qwen/qwen3.6-35b-a3b). COMMITEA_E2E=1 keeps
it unconfigured so the panel stays scripted.

Verified: 88 core tests green (14 agent: client parse, loop tool/error/budget,
all views) + a gated live integration test. Desktop typecheck clean, 14 fixture
e2e green. Gated live e2e drives the real app against gitea + gemma-4-e4b: asked
"what now?", Reginald called query_project and answered "focus is on issue #2"
(the real scheduler pick).

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

packages/core/src/agent/agent-live.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from 'vitest'
+
+import { extractLabelFacts } from '../labels/label-schema.js'
+import type { FetchLike, GiteaIssue } from '../gitea/types.js'
+import { runAgentTurn } from './agent-loop.js'
+import { REGINALD_SYSTEM, REGINALD_TOOLS } from './agent-tools.js'
+import { createChatClient } from './chat-client.js'
+import { buildProjectView, type ProjectSnapshot } from './query-project.js'
+
+/**
+ * Opt-in (COMMITEA_MODEL_LIVE=1). Drives the real chat client + agent loop
+ * against a local OpenAI-compatible server (LM Studio on :1234 by default),
+ * proving the model calls query_project and narrates the real result.
+ */
+const LIVE = !!process.env.COMMITEA_MODEL_LIVE
+const BASE = process.env.COMMITEA_MODEL_URL ?? 'http://localhost:1234/v1'
+const MODEL = process.env.COMMITEA_MODEL_SMALL ?? 'google/gemma-4-e4b'
+
+function issue(over: Partial<GiteaIssue>): GiteaIssue {
+  const labels = over.labels ?? []
+  return {
+    number: 1, title: '#1', body: '', state: 'open', labels, facts: extractLabelFacts(labels),
+    milestone: null, assignee: null, assignees: [], createdAt: '2026-01-05T09:00:00Z',
+    updatedAt: '2026-01-05T09:00:00Z', closedAt: null, url: '', ...over,
+  }
+}
+
+const SNAP: ProjectSnapshot = {
+  issues: [
+    issue({ number: 2, title: 'ChangeSource interface + polling source', labels: ['est/3d', 'p/1'] }),
+    issue({ number: 3, title: 'SQLite cache bootstrap', labels: ['est/2d', 'p/1'] }),
+  ],
+  timelines: {},
+  deps: [{ issue: 3, dependsOn: 2 }],
+}
+
+describe('agent loop (live model)', () => {
+  it.skipIf(!LIVE)(
+    'calls query_project and narrates the real focus',
+    async () => {
+      const client = createChatClient({ baseUrl: BASE, model: MODEL }, globalThis.fetch as unknown as FetchLike)
+      const turn = await runAgentTurn({
+        complete: (m, t) => client.complete(m, t),
+        messages: [
+          { role: 'system', content: REGINALD_SYSTEM },
+          { role: 'user', content: 'What should I work on right now?' },
+        ],
+        tools: REGINALD_TOOLS,
+        execute: async (name, args) =>
+          name === 'query_project'
+            ? buildProjectView((args as { view: any }).view, (args as any).filters, SNAP, new Date())
+            : { error: `unknown tool ${name}` },
+      })
+
+      // it consulted the project, then answered in prose about the real top item (#2)
+      expect(turn.steps.some((s) => s.tool === 'query_project')).toBe(true)
+      expect(turn.content.trim().length).toBeGreaterThan(0)
+      expect(turn.content).toMatch(/#?2\b|ChangeSource/i)
+    },
+    60_000,
+  )
+})