xceadmin/meson.build passes the resolved commit_id/build_time meson
options as two new positional args (matching this custom_target's
existing all-positional style) to meson-build.sh, which writes a small
_build_info.py (GIT_COMMIT/BUILD_TIME, independent per-field "unknown"
fallback) into the mirrored source tree's xceadmin package directory,
before the pip install step -- same before-install ordering as the
existing schema-sync step. A file-existence guard checks the exact path
just written and fails loudly rather than silently proceeding with a
missing/wrong module.
Live-verified via a full real build+test+wheel cycle (run independently
twice, once by implementation and once by review): the mirrored tree's
_build_info.py and the packaged wheel both contain real, matching,
non-"unknown" values (commit id matching git rev-parse --short HEAD plus
dirty suffix, real UTC timestamp); full pytest suite passes (258 passed,
3 skipped -- documented live-HA e2e tests, skip-by-design).
Task 5.1/13 of build-time-versioning.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>