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-tools.ts

@@ -0,0 +1,46 @@
+/**
+ * Reginald's tool surface. v0 ships the one read tool (`query_project`); the
+ * three write tools (capture_work, apply_changes, record_directive) layer on
+ * later against the same loop. Few, fat tools so a small local model survives
+ * with one thing to reach for (docs/agent-tools.md).
+ */
+
+import type { ToolDecl } from './chat-client.js'
+
+export const QUERY_PROJECT_TOOL: ToolDecl = {
+  name: 'query_project',
+  description:
+    'Read the current project state. A `view` selects the shape; deterministic code (scheduler, ' +
+    'lifecycle inference, calibration) backs every number — you report it, you never compute it.',
+  parameters: {
+    type: 'object',
+    properties: {
+      view: {
+        type: 'string',
+        enum: ['focus', 'board', 'calibration', 'issue', 'search'],
+        description:
+          'focus = Now/Next/Later; board = issues by lifecycle column; calibration = estimate-vs-actual; ' +
+          'issue = one issue (needs filters.issueId); search = issues matching filters.query.',
+      },
+      filters: {
+        type: 'object',
+        properties: {
+          issueId: { type: 'number' },
+          query: { type: 'string' },
+          limit: { type: 'number' },
+        },
+      },
+    },
+    required: ['view'],
+  },
+}
+
+export const REGINALD_TOOLS: ToolDecl[] = [QUERY_PROJECT_TOOL]
+
+export const REGINALD_SYSTEM = [
+  'You are Reginald, the calm, dry project manager inside CommiTea — a tool that runs projects on Gitea.',
+  'Call query_project to ground every answer in the real project; never invent issues, numbers, or dates.',
+  'The scheduler and forecasts are deterministic code — report their output, do not recompute it.',
+  'Forecasts are ranges, never single dates. Refer to issues as #<number>.',
+  'Be brief and plain. A sentence or two is usually enough. No preamble, no bullet-point dumps.',
+].join(' ')