- New docs/LegacyDigest.md: full reference for lyng.legacy_digest,
covering the sha1() API, input types (String / Buffer), FIPS compliance
note, and explicit guidance on appropriate vs. inappropriate use.
- docs/ai_stdlib_reference.md: entry in section 5 so AI agents know
LegacyDigest.sha1() exists and is intentionally named as legacy-only.
- docs/whats_new.md: release-note section alongside Complex, Decimal,
and Matrix, with a minimal runnable example and cross-link.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
