Fix 1 — insert_fixture now updates ChunkData bitsets:
Log trunks (can_stand_in=false) now block movement in is_standable.
Leaf canopy (can_stand_in=true) remains walkable.
Fix 2 — Diagonal-aware collision avoidance:
Sidestep priority: left+forward, left, right+forward, right.
If all blocked: push through (excuse me), advance path, apply one-step
delay (speed-modulated recovery). Does not stack delays.
Fix 3 — Movement direction tracking:
Ambulatory now has move_direction (Vec2) and step_history ([i16; 4]).
TileOccupancy tracks per-tile direction hints for Stage 2 collision
(convoy skip, E/S yield) via direction_at().
move_direction is smoothed from: 2 historical steps, current confirmed
step, and 2-step path lookahead.
Ignore: add *.patch and *.diff to .gitignore
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StephenAdamson