fix(runner): add timestamps to Gemini CLI messages in UI

[Gkrumbach07]

Summary

• Pass event timestamps from Gemini CLI NDJSON to AguiAssistantMessage objects
• Converts ISO timestamps to milliseconds for AG-UI compatibility
• Adds timestamps to TextMessageStartEvent for streaming events

Test plan

• Unit tests pass (13/13 Gemini adapter tests)
• Lints pass (ruff check + ruff format)
• Manual test: start Gemini session, verify timestamps appear

Fixes: RHOAIENG-52261

Jira: RHOAIENG-52261

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3409c88d-43a5-4036-a5e4-80adfddb8676

📥 Commits

Reviewing files that changed from the base of the PR and between 538ccbd and e7c2821.

📒 Files selected for processing (1)

• components/runners/ambient-runner/ag_ui_gemini_cli/adapter.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/gemini-timestamps-52261

📝 Coding Plan for PR comments

• Generate coding plan

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[ambient-code]

🤖 PR Fixer Report

✅ Analysis Complete

PR Status: Ready to merge (pending E2E test re-run)

📋 What I Checked

1. ✅ Code Review - Ran /simplify to review for reuse, quality, and efficiency

   • No duplicate code found
   • Timestamp handling is correct and efficient
   • Changes are focused and follow existing patterns

2. ✅ Merge Conflicts - None (PR is mergeable)

3. ✅ Reviewer Comments - None to address (only CodeRabbit rate limit warning)

4. ⚠️ CI Status

   • ✅ Ambient Runner Tests: PASSED (13/13 Gemini adapter tests)
   • ✅ All lints: PASSED
   • ✅ All unit tests: PASSED
   • ❌ E2E Tests: FAILED (unrelated flake)

🔍 E2E Test Failure Analysis

The failing test is a flaky Cypress test unrelated to this PR's changes:

CypressError: cy.click() failed because the page updated while this command was executing.

Root cause: React re-rendering race condition in the frontend test suite (element detached from DOM during click)

Why it's not related to this PR:

• This PR only modifies Python code (ag_ui_gemini_cli/adapter.py)
• The failure is in a frontend Cypress test for session management UI
• The error indicates a timing issue in the test itself, not a regression from timestamp changes

💡 Recommendation

Re-run the E2E Tests workflow - The failure is a known flake. The code changes are correct and all relevant tests pass.

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