sprint A cleanup: accessibility, signals, race, debris

G: large_text scales global theme font (14→20 at 1.4×) via new
GameState.get_font_scale + EventBus.settings_changed. reduce_motion
gates ResumeToast fade (HintOverlay already gated).

I: InspectTooltip long-press wired (500ms hold, 12px drift cancel,
tap-to-clear pin). Stale Phase 19 TODO replaced with accurate doc.

H: Pawn.arrived_at_destination now also emitted on
EventBus.pawn_arrived_at_destination; DirtinessSystem subscribes and
bumps indoor traffic dirt (BUMP_INDOOR_TRAFFIC = 0.2). Outdoor-tracked
bump needs Pawn.prev_tile — flagged for Phase 20.

P: CraftingProvider caches ingredient item ref on Job.ingredient_item;
JobRunner._tick_pickup validates is_instance_valid + not being_carried
before the tile scan, cancels cleanly if another pawn grabbed it.

J: rest_provider.gd deleted. Removed @onready + register call from
world.gd, ext_resource + node from world.tscn. Provider count comment
updated to 9.

M: DIRTY_THRESHOLD extracted — cleaning_provider and job_runner now
reference DirtinessSystem.DIRT_DIRTY_THRESHOLD.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scenes/ai/job.gd

@@ -25,6 +25,13 @@ var current_toil_index: int = 0
 ## on restored JobRunner state.
 var target_node = null
 
+## NOT serialized: the specific Item node reserved for the first PICKUP toil in a
+## crafting job.  Set by CraftingProvider.find_best_for() at proposal time.
+## _tick_pickup validates via is_instance_valid + being_carried before picking up;
+## aborts the job if the item is gone so the pawn re-routes rather than stealing
+## a random item.  null for all non-crafting jobs.
+var ingredient_item = null
+
 
 # ── claim helpers ────────────────────────────────────────────────────────────