aura --version now prints 'aura 0.1.0 (<commit>)', the commit sourced
from the same AURA_COMMIT build provenance the run manifest stamps
(option_env! at build time, 'unknown' fallback, dirty suffix included)
— a pre-run freshness probe: a stale binary is now distinguishable from
an engine bug at the CLI surface, and research docs pinning
'Engine: aura @ <sha>' can verify the binary they invoke.
The version string is memoized as a OnceLock-leaked &'static str:
clap 4.6's builder Str accepts only &'static str (no From<String>), so
the owned-String alternative a quality pass suggested does not build —
verified, held with evidence in the loop report.
closes#266
claude
be9f1cef8c