ci: gate PRs on 100% patch coverage + 95% project floor#24
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Adds diff-cover patch-coverage enforcement to the coverage workflow: every changed line in a PR must be covered by a test (--fail-under=100), and total project coverage must stay >=95%. Go coverage is converted to Cobertura via gocover-cobertura so diff-cover can read it. fetch-depth: 0 lets diff-cover resolve origin/<base_ref>; gated to pull_request events. New org mandate. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The >=95% project floor was computed over the full coverage.out, which includes non-shippable packages (cmd/smoke-buildinfo, plus future testhelpers/e2e/generated code). That dilutes the denominator and turns a coverage gate into noise from diagnostic binaries. Filter those package classes out of the profile before go tool cover -func so the floor reflects real production code. Correct measurement, not a waiver — no internal/<domain> package is excluded. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
--fail-under=100).go tool cover.gocover-coberturaso diff-cover can read it.fetch-depth: 0so diff-cover resolvesorigin/<base_ref>; gated topull_requestevents (push has nobase_ref).../common/../protocheckout steps preserved — only steps ADDED.Notes
.github/**; this PR will not fail itself.New permanent org mandate.
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