CI-hardening mini-WP: GCC+Clang matrix, sanitizers (tests-only), cross-platform Python jobs + CMake version alignment#31
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- ci.yml: 3 NEW non-gating jobs alongside the untouched single-authority build-test job: build-matrix (GCC+Clang, Release, -Werror), sanitizers (ASan+UBSan via job-level CMAKE_CXX_FLAGS, zero CMakeLists change; ctest restricted to the C++ unit tests -- the 7 Python-driven ctests regenerate in place and would touch generated/, banned for sanitizer builds per spec:287-291), python-cross-platform (windows+macos running all 7 python suites + both fillers --check against committed artifacts -- converts the byte-identical-across-platforms claim into CI-enforced evidence). None of the new jobs upload artifacts or gate reproducibility. - CMakeLists: project VERSION 4.0 -> 0.15.1, tied to the git-tag scheme (verified nothing consumes PROJECT_VERSION into committed artifacts). - docs/release_engineering.md: version-inconsistency flag resolved; the v0.13/v0.14 backfilled tags recorded (pushed 2026-07-12). - docs/technical_architecture.md: CI section rewritten for the 4-job reality; corrected a stale 'docs audit still open' sentence (it is wired into test_evidence.py's scan_docs_r16). All 7 local Python suites green; yaml parse-validated; the two new C++ jobs get their first real exercise in this PR's CI run. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Approved mini-WP (spec:287-291). The existing build-test job stays byte-identical as the single reproducibility authority; the 3 new jobs are non-gating-on-artifacts: GCC+Clang matrix, ASan+UBSan on C++ unit tests only (Python ctests excluded -- they regenerate in place, and sanitizer builds must never write generated/), and windows+macos Python-suite runs that turn the cross-platform byte-identity claim into CI-enforced evidence. CMake VERSION 4.0 -> 0.15.1 (nothing consumes it; tied to the tag scheme). v0.13/v0.14 phase tags were backfilled and are live. This PR's CI run is the first real exercise of the new jobs -- a sanitizer finding here would be a genuine deliverable, not a failure.
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