ROB-3921 - Add user_email field to Holmes chat params

[alonelish]

Summary

• Declare user_email: Optional[str] = None on HolmesChatParams (frontend → runner) and HolmesChatRequest (runner → Holmes), placed next to request_source to match the sibling pattern.
• HolmesIssueChatParams / HolmesIssueChatRequest inherit from these, so they pick up the field automatically.

Why

The frontend has started sending user_email on chat requests. Both models already have class Config: extra = "allow" and the runner forwards params via params.dict() → HolmesChatRequest(**params_dict), so the field would already flow through transparently to Holmes without code changes. However, every sibling field (request_type, request_source, conversation_id, source_ref, …) is declared explicitly, and adding user_email to that list gives:

• type validation (Optional[str])
• grep-ability / IDE autocomplete
• a documented contract for readers of the model

Test plan

• Confirm runner accepts a chat request with user_email and forwards it to Holmes unchanged
• Confirm requests without user_email still work (field is optional, defaults to None)

🤖 Generated with Claude Code

[github-actions]

✅ Docker image ready for 177e1f2 (built in 2m 58s)

• us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:177e1f2

⚠️ Warning: does not support ARM (ARM images are built on release only - not on every PR)

Use this tag to pull the image for testing.

📋 Copy commands

⚠️ Temporary images are deleted after 30 days. Copy to a permanent registry before using them:

gcloud auth configure-docker us-central1-docker.pkg.dev
docker pull us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:177e1f2
docker tag us-central1-docker.pkg.dev/robusta-development/temporary-builds/robusta-runner:177e1f2 me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:177e1f2
docker push me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:177e1f2

Patch Helm values in one line:

helm upgrade --install robusta robusta/robusta \
  --reuse-values \
  --set runner.image=me-west1-docker.pkg.dev/robusta-development/development/robusta-runner-dev:177e1f2

[coderabbitai]

Walkthrough

This PR adds an optional user_email field to two related Holmes chat Pydantic models: HolmesChatParams in the base parameters module and HolmesChatRequest in the Holmes reporting module, each defaulting to None.

Changes

Holmes Chat User Email Field

Layer / File(s)	Summary
Add user_email field to Holmes chat schemas src/robusta/core/model/base_params.py, src/robusta/core/reporting/holmes.py	Extended HolmesChatParams and HolmesChatRequest Pydantic models with optional user_email field (Optional[str] = None).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• robusta-dev/robusta#2058: Both PRs modify the same Holmes chat Pydantic schemas (HolmesChatParams and HolmesChatRequest) to extend Holmes chat schema fields.

Suggested reviewers

• moshemorad
• naomi-robusta
• Avi-Robusta

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is well-related to the changeset, explaining the rationale, implementation details, and testing approach for the new user_email field.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately and specifically describes the main change: adding a user_email field to Holmes chat params models.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/crazy-hodgkin-e2a4cc

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