chore: sync workflow templates

[stranske]

Sync Summary

Files Updated

• agents-guard.yml: Agents guard - enforces agents workflow protections (Health 45)
• maint-76-claude-code-review.yml: Claude Code review (opt-in) - runs only on labeled PRs or manual dispatch

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
• AGENTS.md: Repo keeps historical Agents.md casing to avoid case-only path conflicts
• 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: cd5687d7ae00a31b9cb6ddbf94cfb94c0e4fdf69
Template hash: 57b9e3dbcb23
Sync branch: sync/workflows-57b9e3dbcb23
Consumer repo: stranske/Trend_Model_Project
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: 84ecba23-4e65-40f0-862e-9193a2508085

📥 Commits

Reviewing files that changed from the base of the PR and between 160201b and 74d9039.

📒 Files selected for processing (2)

• .github/workflows/agents-guard.yml
• .github/workflows/maint-76-claude-code-review.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/workflows-57b9e3dbcb23

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