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Issue #28 Implementation Doc Stub

1. Issue reference

  • GitHub issue: #28
  • Issue title: [Backend][Chat] Language detect/translate in + translate out
  • Issue type: feature
  • Milestone: Backend RAG M3 - Retrieval & Chat Quality

2. Summary

  • What this issue changed: TBD
  • Why the change was needed: support multilingual input and output reliably across the chat path.

3. Initial repo state

  • Relevant behavior before implementation: multilingual behavior exists in parts of the backend, but this release item isolates input/output language handling as a deliverable.
  • Known constraints or gaps at start: no dedicated plan doc under docs/plans/ is linked for the full chat language I/O workflow.

4. Plan doc referenced

  • Plan doc path: TBD - create a multilingual chat I/O plan under docs/plans/
  • Plan status at implementation start: TBD
  • Was the plan updated during implementation?: TBD
  • If yes, what changed in the plan?: TBD

5. Decisions taken

Decision Reason Alternative rejected
Stub only Reserve issue-level implementation traceability before coding starts. Deferring the implementation record until after chat behavior changes land.

6. Files changed

File Change summary
docs/implementation/issue-28-language-detect-translate-in-translate-out.md Created implementation doc stub.

7. Migrations / schema changes

  • Migration files: none yet
  • Schema changes: none yet
  • Data backfill or manual steps: none yet
  • Rollback notes: not applicable yet

8. API changes

Surface Change Compatibility impact
None yet No implementation details recorded yet. None

9. Tests added or updated

Test file or suite Change
None yet No implementation work has started.

10. Risks / caveats

  • Language handling is user-visible and can regress output safety or retrieval quality if implemented without a current plan.

11. Follow-up work

  • Create the matching multilingual chat I/O plan doc.
  • Capture model, fallback, and regression test decisions during implementation.

12. Final repo state

  • Relevant behavior after implementation: not implemented yet; stub created to reserve the issue record.
  • Remaining limitations: plan, implementation, and validation details are still pending.

13. Docs updated

Doc path Update summary
docs/implementation/issue-28-language-detect-translate-in-translate-out.md Added initial implementation doc stub.