chore: configure Copilot task and review guardrails

[rrahimi-uci]

Summary

Adds repository-wide Copilot instructions and a pull request template so assigned feature, bug-fix, and development tasks require tests or an explicit non-code validation rationale before human review. Copilot is explicitly prohibited from approving or merging pull requests.

Tests and validation

• Added repository-specific validation guidance and required PR evidence.
• Ran git diff --check successfully in each repository.
• Existing repository CI workflows were inspected and referenced; no existing workflow was removed or weakened.
• No production code, credentials, or runtime configuration was changed.

Validation commands and results:

• git diff --check — passed in all 10 repositories.
• Repository CI — will run on each PR; the instruction files identify the applicable commands for each repository.

Risks and follow-up

The instruction and template are guidance and evidence requirements; Copilot behavior remains subject to GitHub Copilot service availability and the repository CI configuration. Repositories without existing CI retain explicit syntax/documentation validation guidance rather than claiming nonexistent tests. Automatic Copilot review is configured separately at the repository settings level and is comment-only.

Copilot handoff

• This PR is ready for human review only after applicable validation passes.
• Copilot did not approve or merge this PR.
• Merge authority remains with the repository owner.

[Copilot]

Pull request overview

This PR adds repository-level contribution guardrails by introducing a standard pull request template and GitHub Copilot repository instructions, aiming to ensure changes are accompanied by appropriate validation evidence and to explicitly prevent Copilot from taking merge/approval actions.

Changes:

• Added a pull request template that requires authors to document tests/validation, git diff --check, and risks before requesting human review.
• Added .github/copilot-instructions.md to codify expected validation steps and prohibit Copilot from approving/merging PRs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/PULL_REQUEST_TEMPLATE.md	Adds an evidence-driven PR template (tests/validation, risks, Copilot handoff).
.github/copilot-instructions.md	Adds repository-wide Copilot guidance, including explicit “no approve/merge” and validation command expectations.

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