feat(simulation): Sprint 6 Touch — stance, tile presence, verbs, protocol v6 · 98f4cedc03 - settled-reach

feat(simulation): Sprint 6 Touch — stance, tile presence, verbs, protocol v6

Implements the core Sprint 6: Touch systems across 5 tickets:

- #449 ObserverSnapshot v6: add player_stance (MovementStance) and
  player_inventory (Vec<InventoryItem>) wire fields with serde defaults
  for backward compatibility. Bump PROTOCOL_VERSION 5→6.

- #417 Stance system: Sprint/Walk/Careful/Crouch movement stance with
  tick-based speed (1/2/3/4 ticks per move), monologue rate multipliers,
  and PlayerMoveCooldown component. ToggleStanceUp/Down player actions.

- #420 TilePresence: posture-layer collision system allowing same-tile
  occupancy for different layers (Standing/Prone/Seated/Fixture).
  Layer-based collision in validate_movement.

- #421 ObjectType component: Readable/Container/Terminal/Door/Pickup/
  Furniture types with Phase 1 verb sets computed from type + proximity.

- #422 Phase 2 verb filter: KG-gated observer-side verb processing —
  POI priority flips, Confront injection at KnowsDetails+, contradiction
  marking, archetype-specific label relabeling (Smuggler/Detective).

217 unit tests + 17 integration tests passing. All MessagePack fixtures
regenerated for v6 wire format.

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

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