Require ci-extended pass for workflow and infrastructure PRs

[Chris0Jeky]

Summary

• Add **/*.csproj path trigger to ci-extended.yml so project file changes auto-trigger the extended CI lane (workflow, deploy, scripts, backend, and frontend paths were already covered)
• Add CI Extended validation reminder to PR template checklist
• Document CI Extended requirement for infrastructure PRs in AGENTS.md contributor protocol

Closes #608

Verification

• YAML syntax validated via python -c "import yaml; yaml.safe_load(...)"
• Existing triggers (label-based, manual dispatch) preserved unchanged
• Path filter uses correct GitHub Actions glob syntax (**/*.csproj with quotes for YAML safety)
• Conditional job logic (if: guards on label checks) not affected by path filter additions

Test plan

• Verify CI Extended triggers on a PR that only modifies a .csproj file
• Verify existing label-triggered jobs (testing, security, automation) still work
• Verify manual workflow_dispatch still works

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[Chris0Jeky]

Self-Review Findings

Path filter correctness: The **/*.csproj pattern uses GitHub Actions glob syntax correctly -- ** matches any directory depth and *.csproj matches the filename. Quoted in YAML to avoid special character issues.

Existing triggers preserved: The labeled, workflow_dispatch, and other pull_request event types are unchanged. Label-gated jobs (testing, security, automation) use if: conditions that check contains(github.event.pull_request.labels.*.name, ...) -- these are independent of path filters and remain correct.

Will this run too often? The backend/** and frontend/** path filters were already present, so ci-extended already triggers on most code PRs. Adding **/*.csproj is a narrow addition -- .csproj files rarely change outside backend/ (already covered), so the incremental trigger increase is minimal.

Concurrency handling: The existing cancel-in-progress: true concurrency group means rapid pushes won't pile up runs.

No issues found -- the change is minimal and safe.

[gemini-code-assist]

Code Review

This pull request updates the pull request template and agent documentation to include instructions for validating the CI Extended workflow. Feedback was provided to include missing directory paths (backend/ and frontend/) and to use a more accurate glob pattern (**/*.csproj) for project files in both the PR template and the agent guidelines.

[gemini-code-assist]

The list of paths that trigger CI Extended is incomplete. According to the PR summary, backend/ and frontend/ paths also trigger this workflow. Additionally, the glob pattern should be **/*.csproj to accurately reflect that project files in subdirectories (like backend/src/...) are included in the trigger.

Suggested change

	- [ ] If this PR touches `.github/workflows/`, `deploy/`, `scripts/`, or `*.csproj` files: confirm CI Extended passed (auto-triggered on these paths)
	- [ ] If this PR touches `.github/workflows/`, `deploy/`, `scripts/`, `backend/`, `frontend/`, or `**/*.csproj` files: confirm CI Extended passed (auto-triggered on these paths)

[gemini-code-assist]

This documentation should include backend/ and frontend/ as they also trigger CI Extended according to the PR description. Also, using the explicit glob **/*.csproj is clearer for agents and matches the implementation described in the PR summary.

Suggested change

	- PRs touching CI workflows (`.github/workflows/`), infrastructure (`deploy/`, `scripts/`), or project files (`*.csproj`) auto-trigger CI Extended. Ensure CI Extended is green before merging these PRs.
	- PRs touching CI workflows (`.github/workflows/`), infrastructure (`deploy/`, `scripts/`), application code (`backend/`, `frontend/`), or project files (`**/*.csproj`) auto-trigger CI Extended. Ensure CI Extended is green before merging these PRs.