emrg: test — fix Agent.md renderer count drift (445->448) + guard renderer count against reality

Agent.md

@@ -119,9 +119,9 @@ Community needs voiced in HN agent-UI discussions map directly to EMRG's design:
 pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.token; python -m emrg
 ```
 
-Python: `uv run pytest tests/ -v` (1127) — import check: `uv run python -c "from emrg.client.app import run_client"`
+Python: `uv run pytest tests/ -v` (1128) — import check: `uv run python -c "from emrg.client.app import run_client"`
 GUI: `cd emrg/gui && npm test` (95: 45 daemon_client + 20 conn-manager + 8 integration + 6 build-config + 7 gui-state + 3 preload-api + 4 boot-contract + 2 theme-guard) — syntax: `node --check main.js preload.js daemon_client.js`
-Renderer: `cd emrg/gui/renderer && npm run typecheck && npm test` (445: 5 snapshot-store + 9 utils + 3 ErrorBoundary + 2 App smoke + 11 commands + 4 copywriting + 11 i18n + 11 markdown + 15 transcript + 7 TranscriptView + 15 history + 22 composer + 14 Composer + 12 sidebar + 17 Sidebar + 9 fileTree + 9 FileTree + 16 resultPanel + 8 ResultPanel + 29 workspaceView + 8 WorkspaceView + 10 dialog + 6 Dialog + 9 ConfirmDialog + 9 RenameDialog + 10 dialogLists + 3 HelpDialog + 9 MemoryDialog + 6 SkillsDialog + 9 openSession + 6 WelcomeDialog + 8 OpenSessionDialog + 7 NewSessionDialog + 7 rewind + 8 RewindDialog + 7 GithubDeviceDialog + 14 daemonBridge + 7 DaemonBridgeProvider + 24 Shell + 15 DialogHost + 19 SettingsPanel + 6 TaskFormDialog + 5 RantDialog + 4 vendorMarkdown) + `npm run build` → `renderer/dist/`
+Renderer: `cd emrg/gui/renderer && npm run typecheck && npm test` (448: 5 snapshot-store + 9 utils + 3 ErrorBoundary + 2 App smoke + 11 commands + 4 copywriting + 11 i18n + 11 markdown + 15 transcript + 7 TranscriptView + 15 history + 22 composer + 14 Composer + 12 sidebar + 17 Sidebar + 9 fileTree + 9 FileTree + 16 resultPanel + 8 ResultPanel + 27 workspaceView + 10 WorkspaceView + 10 dialog + 6 Dialog + 9 ConfirmDialog + 9 RenameDialog + 10 dialogLists + 3 HelpDialog + 9 MemoryDialog + 6 SkillsDialog + 9 openSession + 6 WelcomeDialog + 8 OpenSessionDialog + 7 NewSessionDialog + 7 rewind + 8 RewindDialog + 7 GithubDeviceDialog + 15 daemonBridge + 7 DaemonBridgeProvider + 25 Shell + 15 DialogHost + 20 SettingsPanel + 6 TaskFormDialog + 5 RantDialog + 4 vendorMarkdown) + `npm run build` → `renderer/dist/`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 Git-over-https 兜底: `python scripts/sync-master-from-api.py [--repo owner/name] [--ref master]` — 受限网络下 github.com:443 不可达而 api.github.com 可达时，用 Git Data API 的 verification payload + signature 字节级重建上游 commit（含 web-flow GPG 签名 squash merge，reconstruct_commit 经 hermetic 测试验证 sha 一致）并推进本地 refs；内容对象缺失时 fail-loud 提示改用 git fetch（10+ 周期实证的恢复路径）

tests/test_doc_counts.py

@@ -140,3 +140,40 @@ def test_evolution_prompt_no_quick_ref_block() -> None:
         "(rant 2026-08-17T14:22:21, #822)"
     )
 
+
+
+def _static_renderer_count() -> int:
+    """Count renderer vitest cases statically (no node_modules needed).
+
+    Matches vitest's executed total exactly: for every renderer test file the
+    ``^\\s*(it|test)(`` definition count equals the number of executed cases
+    (verified for all 44 files, R2254). Files are under
+    ``emrg/gui/renderer/src`` with ``.test.ts`` / ``.test.tsx`` suffixes.
+    """
+    base = REPO_ROOT / "emrg" / "gui" / "renderer" / "src"
+    total = 0
+    for f in sorted(base.rglob("*.test.ts")) + sorted(base.rglob("*.test.tsx")):
+        text = f.read_text(encoding="utf-8")
+        total += len(re.findall(r"^\s*(?:it|test)\(", text, re.M))
+    return total
+
+
+def test_renderer_count_matches_docs() -> None:
+    """Agent.md's Renderer headline must equal the real vitest count.
+
+    R2254 (#1049/#1050): renderer tests grew 445 -> 448 without Agent.md being
+    bumped. The GUI-breakdown guard only validates each "(N: ...)" line's
+    *internal* sum (parts sum to headline) — it cannot see reality, and the
+    pytest CI job has no node_modules to run vitest. The static definition
+    count equals vitest's executed total, so this guard runs everywhere
+    pytest does and turns the drift red immediately.
+    """
+    renderer = [b for b in _gui_breakdowns() if "Renderer" in b[0]]
+    assert renderer, "Agent.md must document the Renderer test breakdown"
+    label, headline, parts = renderer[0]
+    static = _static_renderer_count()
+    assert headline == static, (
+        f"{label}: documents {headline} renderer tests but {static} are "
+        f"counted statically (vitest-equivalent). Sync Agent.md when "
+        "adding/removing renderer tests."
+    )