zencodec 0.1.17

Authority-aware color resolution.

Added:

• SourceColor::to_color_context() — drops non-authoritative field.
• helpers::descriptor_for_decoded_pixels_v2 — widens corrected_to to Option<&ColorProfileSource>; drops placebo IccMatchTolerance.
• helpers::resolve_color — composable (ColorPrimaries, TransferFunction) resolution for per-format descriptors.

Fixed:

• descriptor_for_decoded_pixels now respects color_authority when both CICP and ICC are populated (previously CICP always won, violating JPEG/PNG-iCCP spec).

Deprecated:

• helpers::descriptor_for_decoded_pixels — migrate to _v2.

Changed:

• Bump zenpixels 0.2.7 → 0.2.8.

See CHANGELOG.md for full notes.