fix(api): keep session resolver helpers internal

[namastex888]

Summary

• Fix red dev CI from bunx knip by keeping internal agent-session-identity helper functions non-exported.
• No behavior change: resolveKhalSessionId, explicit session extraction, and canonical KHAL session builder remain exported and tested.

Test Plan

• bunx knip
• bunx biome check packages/api/src/services/agent-session-identity.ts packages/api/src/services/__tests__/agent-session-identity.test.ts
• (cd packages/api && bun test src/services/__tests__/agent-session-identity.test.ts src/plugins/__tests__/session-cleaner.test.ts) — 5 pass, 0 fail
• (cd packages/api && bun run typecheck)

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[gemini-code-assist]

Code Review

This pull request restricts the visibility of the 'resolveKhalEnvironment' and 'channelToKhalSessionSegment' functions in 'packages/api/src/services/agent-session-identity.ts' by removing their 'export' keywords, making them internal to the module. There are no review comments, and I have no feedback to provide.

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