fix(web-search): release OpenAI sidecar probe when sidecar validation returns early

[luvs01]

Motivation

• Prevent a probe-lease leak when OpenAI web-search sidecar auth is resolved but executeResponsesSidecars returns a pre-dispatch Response (for example on malformed tool-result input) before the runTurn cleanup runs.
• The leak can retain a quota-recovery probe on a pool account and delay its recovery under narrow conditions, so the runtime must release the lease on early validation exits.

Description

• Call sidecarState.openAiSidecar?.releaseProbeLease?.() before returning when executeResponsesSidecars returns a Response to ensure any acquired probe lease is released immediately. (src/server/responses/core.ts).
• Add a focused regression test that stubs prepareResponsesSidecarAuth to simulate a held probe lease and asserts a pre-dispatch 400 response releases the probe and does not dispatch the adapter. (tests/responses/responses-run-turn-web-search.test.ts).
• Keep the change narrowly scoped to releasing the resolved OpenAI sidecar probe on early-sidecar validation failures and add a test fixture to exercise that specific path.

Testing

• Ran the focused regression: bun test tests/responses/responses-run-turn-web-search.test.ts --timeout 30000 which passed (16 tests, 0 failures).
• Ran static checks and project validation: bun run typecheck (passed), bun run structure:check (passed), and bun run privacy:scan (passed).
• bun run test:changed could not be executed in this checkout due to a missing comparison ref (dev/origin/dev/upstream/dev), so focused regression coverage was used instead.

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[github-actions]

✅ Deterministic PR hygiene checks passed.

[devin-ai-integration]

Fixed in 7266ca2 — see reply above.

[luvs01]

이관됨: lidge-jun#6047

[luvs01]

동일 수정이 상류 저장소에 제출되어 이 포크 PR의 목적은 달성됐습니다.