Hashavatar 0.10.0

hashavatar 0.10.0

0.10.0 introduces the visual layer model while keeping the existing
AvatarOptions rendering path stable.

Added

• AvatarAccessory with none, glasses, hat, headphones, crown,
  bowtie, eyepatch, scarf, halo, and horns.
• AvatarColor with default, neon-mint, pastel-pink, crimson, gold,
  and deep-sea-blue.
• AvatarExpression with default, happy, grumpy, surprised, sleepy,
  winking, cool, and crying.
• AvatarShape with square, circle, squircle, hexagon, and octagon.
• AvatarStyleOptions for explicit kind, background, accessory, color,
  expression, and frame-shape selection.
• Style-aware raster, SVG, and encode APIs:
  • render_avatar_style_for_id
  • render_avatar_svg_style_for_id
  • encode_avatar_style_for_id
  • namespace and identity-options variants for each
• Automatic style APIs:
  • render_avatar_auto_for_id
  • render_avatar_svg_auto_for_id
  • encode_avatar_auto_for_id
  • namespace and identity-options variants for each
• Public digest-byte constants for automatic style derivation.
• Family-aware face anchors for accessory and expression placement.
• README option catalog covering all public enum values and the difference
  between AvatarOptions and AvatarStyleOptions.

Compatibility

Existing AvatarOptions output is unchanged. Legacy options map to
accessory = none, color = default, expression = default, and
shape = square.

Automatic style rendering is opt-in. It derives kind, background, accessory,
color, expression, and shape from distinct identity digest bytes using each
enum's ALL list.

Accessories and expressions are deterministic no-ops for non-face avatar
families where the layer cannot be placed sensibly. For example, paws with an
eyepatch renders the baseline paws avatar rather than placing a patch at an
arbitrary canvas position.

Security And Testing

• README security guidance now includes explicit caller-side zeroization and
  service-side render-concurrency examples for high-assurance deployments.
• Fuzz coverage now exercises the style-aware render and encode APIs.
• Golden fingerprints cover representative layered avatars and automatic style
  output.
• Tests enforce parser/display round trips, enum ALL drift protection,
  distinct automatic digest offsets, manual layer selection, and raster/SVG
  support for all baseline layer variants.
• Tests enforce deterministic no-op behavior for unsupported family/layer
  combinations.