chore(gates): add a comment to explain PR quality gates

[dubloom]

Description

Adding documentation for PR-level gate following the provided template.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-08-14 12:04:46

Comparing candidate commit 14a36d5 in PR branch dubloom/chore/gate-comment with baseline commit f0e5037 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1 metrics, 0 unstable metrics.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.56%. Comparing base (f0e5037) to head (14a36d5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   86.56%   86.56%           
=======================================
  Files          82       82           
  Lines        5358     5358           
=======================================
  Hits         4638     4638           
  Misses        720      720           

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