laminate v0.4.1

Docs-only patch release.

Documentation

• Comprehensive README and FEATURES.md rewrite, verified against the source.
  The README now encompasses the full library (a complete capability map plus the
  highlighted features) and FEATURES.md corrects numerous inaccurate signatures,
  counts, and behaviors (for example: shape_strict returns the value, not a
  LaminateResult; ViolationKind has five variants) while documenting
  previously-undocumented public surface: enum derive with #[laminate(unknown)],
  from_llm_response, the Coercible coercion API, the medical
  clinical-calculation and reference-range suite, schema inference config and the
  coercible audit tier, provider emit, MessageSnapshot, and the standalone
  SSE parser.
• Fixed pack module doc-comment counts (currency 29 codes / 19 symbols; medical
  44 conversions across 36 analytes) and removed an unimplemented UTM/MGRS/Plus
  Codes claim from the geo pack docs.

Changed

• crates.io keyword flexible replaced with llm for discoverability. No API
  change.

No code or API changes; laminate 0.4.1 is a drop-in replacement for 0.4.0.