Adds xce_compose_version_ex() as a sibling of the existing, completely
untouched xce_compose_version(): when dirty_fingerprint is non-empty, it
strips a trailing -dirty from the commit field (anchored tail-slice
strcmp, not a substring search) and appends -<dirty_fingerprint> instead;
when empty/NULL, it delegates directly to the original function, so
output is structurally guaranteed byte-identical -- including the
Requirement 5.2 fallback case (dirty tree, fingerprint computation
failed) where commit_id's own pre-existing -dirty suffix already signals
"modified" with no new sentinel needed.
No main.c call sites touched -- consuming daemons (tasks 3.2/3.3) still
call the original xce_compose_version() and will switch to the new
function themselves.
Verified independently by review, full lib suite on both debug and ASAN
profiles: 301 tests, 0 failures, 0 ignored; suffix-anchoring, buffer
safety, and the empty-fingerprint delegation path all confirmed correct
by hand-tracing the implementation, not just trusting the test results.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Rongsong Shen
7ebcba6d49