chore: append pr review instructions section to copilot-instructions.md

[iloveagent57]

Summary

Append the PR Review Instructions section (house rules, security, test coverage, and output format) from docs/templates/copilot-instructions.md.template in ai-devtools-internal.

Adds three sequential concern passes to .github/copilot-instructions.md:

1. Architecture fit — four House Rules (reuse before reinvent, earn every guard, YAGNI/trust defaults, respect source of truth). Biased toward flagging excess and redundancy, not absence. Rules 1 & 4 require naming the existing symbol and path; no name, no finding.
2. Security — auth/permissions, input validation, injection, PII annotations, CSRF. edx-drf-extensions/edx-rbac for backends; XSS/key exposure for frontends.
3. Test coverage — untested new logic, implementation-detail assertions, missing edge cases, brittle snapshots.

Structured output format: HEADLINE, House-Rule Findings table with file:line evidence, Security & Tests list, HOTSPOTS, and MERGE_READINESS: READY | CHANGES_REQUIRED | REJECT_SCOPE.

File changed: .github/copilot-instructions.md

🤖 Generated by the cross-repo-patch skill.

[openedx-webhooks]

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Details

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.65%. Comparing base (8ed796e) to head (d0cf723).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2653   +/-   ##
=======================================
  Coverage   86.65%   86.65%           
=======================================
  Files         257      257           
  Lines       16954    16954           
  Branches     1677     1677           
=======================================
  Hits        14692    14692           
  Misses       1927     1927           
  Partials      335      335           

Flag	Coverage Δ
unittests	86.65% <ø> (ø)

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