Add flower-chomping, greetings, black sheep, and bumping

- Flowers: every 60-120s a sheep stops to eat a daisy (procedurally
  drawn with petals disappearing as it chomps, using anim 26)
- Greetings: two sheep approaching each other freeze and face one
  another for ~2s before going their separate ways
- Bumping: overlapping sheep boing off each other and reverse direction
- Black sheep: a near-black-tinted visitor wanders in from a random
  edge every 3-6 minutes, does the full blacksheep sequence (anims
  28-34) and fades out; UFOs won't abduct it

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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