chore: sync workflow templates

[stranske]

Sync Summary

Files Updated

• aggregate_agent_metrics.py: Aggregates downloaded weekly agent metrics - required by agents-weekly-metrics.yml
• WORKFLOW_USER_GUIDE.md: Workflow user guide - explains the CI/agent system for repo consumers

Files Skipped

• pr-00-gate.yml: File exists and sync_mode is create_only
• ci.yml: File exists and sync_mode is create_only
• renovate.json: File exists and sync_mode is create_only
• cross-repo-smoke.yml: File exists and sync_mode is create_only
• llm_slots.json: None

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Review Checklist

• CI passes with updated workflows
• No repo-specific customizations were overwritten

Source: stranske/Workflows
Source SHA: 44d51b72f58af2242821fae89108ea2c8d4d2d2c
Template hash: 6355de2a0daa
Sync branch: sync/workflows-6355de2a0daa
Consumer repo: stranske/Pension-Data
Manifest: .github/sync-manifest.yml

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 41d79e14-c3e6-4a6b-acad-d85d5dac3ab6

📥 Commits

Reviewing files that changed from the base of the PR and between 74da5f3 and c8f30fb.

📒 Files selected for processing (2)

• WORKFLOW_USER_GUIDE.md
• scripts/aggregate_agent_metrics.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/workflows-6355de2a0daa

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

Workflow state fingerprint for Keepalive Loop Reporter. Do not edit.

[github-actions]

Workflow state fingerprint for Agents Gate Followups. Do not edit.

[stranske]

Closing as stale: newer sync PR #555 was opened from Workflows main after stranske/Workflows#2396 merged.