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perf(tests): optimize coverage instrumentation and reporting pipeline #484

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brent.edwards wants to merge 3 commits from perf/optimize-coverage-pipeline into master
pull from: perf/optimize-coverage-pipeline
merge into: cleveragents:master
Conversation 2 Commits 3 Files Changed 5
+149 -41

3 Commits

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brent.edwards fd82a9852c Merge branch 'master' into perf/optimize-coverage-pipeline
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2026-03-01 05:58:21 +00:00
brent.edwards 812a880811 Merge branch 'master' into perf/optimize-coverage-pipeline
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2026-03-01 03:53:44 +00:00
brent.edwards 4629c44fc0 perf(tests): optimize coverage instrumentation and reporting pipeline
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Replace coverage.py (sys.settrace-based) with slipcover (bytecode-based
instrumentation) for significantly faster coverage collection:

- Each behave-parallel worker runs under slipcover, producing per-feature
  JSON coverage files with unique UUIDs to avoid write contention.
- After all workers finish, slipcover --merge combines per-worker data
  into a single build/coverage.json report.
- XML report generated via slipcover --merge --xml for CI tooling.
- Terminal report with --fail-under=97 threshold enforcement.
- Robust JSON key-fallback logic handles both slipcover ('summary') and
  coverage.py ('totals') output formats.

CI workflow fixes:
- ci.yml 'Surface coverage summary' step uses defensive key lookup
  instead of hardcoded ['totals']['percent_covered'].
- nightly-quality.yml applies same fallback pattern.

Documentation updated to reflect slipcover as the coverage tool.

Part of #478. Closes #482.
 2026-03-01 02:57:36 +00:00