fix(openai-chat): bring openai-chat.ts back under its file-size cap

[lidge-jun]

Summary

dev fails file-size ratchet: repository: #5804 left src/adapters/openai-chat.ts at 823 lines against its 822-line cap, so every branch cut from dev goes red on that test. The cap only moves down, so this moves code instead of raising it.

The freeform-tool lookup #5804 added is built by freeformToolsByWireName() in src/adapters/openai-chat/serialized-tool-call-content.ts, beside the echo matching that consumes it. The { name, namespace } shape repeated four times across both files is now one FreeformToolIdentity type. openai-chat.ts is back to 822 lines. Behavior is unchanged.

Verification

• bun test tests/ci-workflows/file-size-ratchet.test.ts plus every openai-chat, chat tool-call, chat-compat, and MiMo test file (29 files): 462 pass, 0 fail.
• tests/adapters/openai/openai-chat-serialized-tool-call-content.test.ts gains a case for freeformToolsByWireName(): only freeform tools are kept, keyed by wire name, with the declared name and namespace (42 pass).
• bun x tsc --noEmit, bun run structure:check, bun run privacy:scan: pass.
• Squash-merged without waiting for PR CI at the maintainer's request (CI backlog); the full suite runs on dev after merge.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed. (none needed; no behavior change)
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults. (none touched)

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-25T05:29:17.331040Z	201b5fe	PR opened

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• src/adapters/openai-chat.ts
• src/adapters/openai-chat/serialized-tool-call-content.ts

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