fix(runtime): record served optimizer receipt model

[drewstone]

Summary

• Record the provider-served model in successful profileOptimizerModelCall cost receipts.
• Preserve the declared model and unknown usage on failed or unproven paths.
• Add routed snapshot and failed-path regressions.
• Release as 0.133.3.

Proof

• pnpm exec vitest run src/runtime/profile-chat-client.test.ts — 18/18 passed.
• pnpm run lint — passed.
• pnpm run typecheck — passed.
• pnpm run check:version-bump — passed.
• pnpm run docs:freshness — passed.
• pnpm run verify:package — passed.

[tangletools]

✅ Auto-approved drewstone PR — 7fa07b5f

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-08-13T04:41:57Z}

[drewstone]

Superseded by PR #816, which contains the same fix plus the stricter failed-path observed-model check.