ci: request a Copilot review once CI first passes on a PR to main

[alongd]

What

Adds .github/workflows/copilot-review.yml: the first time a PR to main passes CI, it requests a Copilot code review — once.

How

Listens on workflow_run for the CI workflow completing with conclusion == success on a pull_request, resolves the PR (event payload for same-repo PRs; head-SHA lookup for forks), and adds copilot-pull-request-reviewer[bot] as a reviewer. A dedup check (skip if Copilot is already requested or has already reviewed) keeps it to one pass per PR — it does not re-fire on later green pushes.

Why gated on green, not a ruleset

A copilot_code_review branch ruleset can only fire on PR open or on every push — it cannot wait for CI. Gating on green keeps Copilot off red branches and off the quota until the branch actually builds, and holds it to a single review.

Notes

• Config-only: no change to ci.yml or any source/test.
• The listener activates once this is on main; it takes effect on the next PR.
• permissions: pull-requests: write, contents: read.

[Copilot]

Pull request overview

Adds a GitHub Actions workflow that requests a GitHub Copilot code review automatically the first time CI succeeds for a PR targeting main, using workflow_run as the trigger and dedup logic to keep it to one review per PR.

Changes:

• Introduces .github/workflows/copilot-review.yml to listen for successful T3 CI runs on PRs.
• Resolves the associated PR (payload for same-repo PRs; head-SHA lookup fallback for forks) and requests copilot-pull-request-reviewer[bot].
• Skips requesting if Copilot is already requested or has already reviewed.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.71%. Comparing base (25378f4) to head (63f68d3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
+ Coverage   82.69%   82.71%   +0.01%     
==========================================
  Files          72       72              
  Lines       11709    11720      +11     
  Branches     2524     2526       +2     
==========================================
+ Hits         9683     9694      +11     
  Misses       1434     1434              
  Partials      592      592              

Flag	Coverage Δ
unittests	82.71% <ø> (+0.01%)	⬆️

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