chore(examples): drop stray host-test probe note; add mcp-app typecheck and make it pass --strict

[ScriptedAlchemy]

Follow-up cleanup from #471 (examples only; no publishable package touched).

Change	Files	Why
Delete stray probe-note.txt	examples/host-test/probe-note.txt	Left over from a lineage probe; not referenced by the README, the docs page, or any test.
Add typecheck script to mcp-app	examples/mcp-app/package.json, examples/mcp-app/tsconfig.json (new)	Every other example defines "typecheck": "tsc -p tsconfig.json --noEmit" and runs it from check; mcp-app was the only one without a tsconfig or typecheck. Same extends/jsx shape as the siblings, include adds evals/** and views/** because this example has both. check now runs validate → build → typecheck.
src/compiler-status-contract.ts:27 — TS18046 'value.checks' is of type 'unknown'	examples/mcp-app/src/compiler-status-contract.ts	The Array.isArray(value.checks) narrowing on a Record<string, unknown> property did not survive into the every callback. Bind checks once, guard it, index the binding. Runtime behavior unchanged.
Browser test typed against the public helper	examples/mcp-app/tests/browser-app/status-panel.browser.test.ts	Surfaced by the new typecheck: the operations() stub returned Promise<unknown> from callTool, which MountBrowserAppOptions['operations'] rejects. Typed via MountBrowserAppOptions (public agent-bundle/test/browser export) so it stays in step with the helper.
Docs/README mention the new step	examples/mcp-app/README.md, website/docs/{en,zh}/examples/mcp-app.mdx	pnpm check description and the non-interactive command list now include pnpm typecheck.

Verification

• examples/mcp-app: pnpm typecheck clean; pnpm check (validate + build + typecheck) passes; pnpm test:browser-app 4/4; agent-bundle eval --case status-is-healthy --trials 1 1 passed.
• Repo: packages/agent-bundle/tests/examples-contract.test.ts + examples-check-script.test.ts — 6 passed, 0 failed.
• Root pnpm typecheck and pnpm lint clean (0 errors, 1151 files).
• pnpm docs:site:build passes (dead-link + language parity) for the two mcp-app.mdx edits.

Changeset

None: only examples/* and website/ (private, ignored by the changeset config), as in #471.

Review status

Merged under the maintainer's relaxation for the Release gates / release-audit.test.ts failure (npm advisories endpoint, red on main, being removed in #487) if that is the only red check.

[changeset-bot]

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Latest commit: 2e60893

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T00:35:06.337755Z	2e60893	PR opened

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@491

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@491

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/@agent-bundle/runtime@491

commit: 2e60893