revert(cli): re-enable session export

[lambertjosh]

Summary

• Revert fix(cli): temporarily disable session export #10924 now that the temporary session-export shutdown can be lifted.
• Restore free-model session and Git workspace export startup and request capture.
• Add a new patch changeset because the reverted PR's original changeset has already been released.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/restore-session-export.md
• packages/opencode/src/kilocode/bootstrap.ts
• packages/opencode/src/kilocode/session-export/session-export.ts
• packages/opencode/src/session/llm.ts

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_{Reviewed by claude-4.6-sonnet-20260217 · 464,006 tokens}

_{Review guidance: REVIEW.md from base branch main}