Phase 16: Save/load full coverage + autosave + UI

Three-agent fan-out reusing the contracts-first pattern: Opus pre-wrote
World.clear_all + 4 EventBus signals (save_started/finished, load_started/
finished) before dispatch. Pattern proven across Phases 12/13/14/15/16.

Entity to_dict/from_dict + class_id tagging (Agent A):
- class_id tag added to all 18 entity to_dict methods for loader routing
- Missing pairs filled in: wolf, grave_slot, graveyard_zone, stockpile_zone,
  crate (from_dict). All defensive with d.get(field, default).
- Workbench round-trips label_text so Carpenter/Smelter/Millstone/Hearth/
  Pyre kinds survive reload
- BeautySystem + DirtinessSystem save_dict/apply_dict for sparse maps
- World.save_tilemap_layers / apply_tilemap_layers covering 5 layers
  (Terrain/Floor/Wall/Designation/Roof; Fog runtime-only skipped)

SaveSystem v2 rewrite (Agent B):
- SAVE_VERSION bumped from 1 to 2
- write_save(slot) pauses Sim, emits save_started, collects every entity
  via _collect_entities iterating all World registries, writes payload to
  user://save_<slot>.json
- apply_save full rewrite: pause sim → emit load_started → World.clear_all
  → apply autoloads (GameState/Clock/Weather/Storyteller) → apply tilemap
  layers → iterate payload.entities and dispatch to per-class factories
  → apply beauty/dirt maps → emit load_finished(slot, ok, real_seconds_away)
- Per-class factory registry: 18 class_ids dispatched to setup+add_child+
  from_dict patterns. CremationPyre detected via workbench.label_text == 'Pyre'
- Public slot API: save_to_slot/load_from_slot/has_save/delete_save/
  peek_save_metadata. Slots locked: &manual + &autosave

Autosave + UI + Resume toast (Agent C):
- autoload/autosave.gd — new Autosave autoload. Periodic every
  AUTOSAVE_INTERVAL_TICKS = 6000 (~5 in-game min at 20 Hz) + NOTIFICATION_
  APPLICATION_PAUSED (mobile) + NOTIFICATION_WM_WINDOW_FOCUS_OUT (desktop).
  Gated by _busy flag tied to EventBus.save_started/save_finished.
- TopBar extended with SaveBtn (💾) + LoadBtn buttons, 48×48 min hit area
- scenes/ui/load_menu.gd — CanvasLayer slot picker. Reads peek_save_metadata
  to show 'Manual save (Date Time)' / 'Autosave (Date Time)' rows.
  Version-mismatch warning dialog before continuing on older saves.
- scenes/ui/resume_toast.gd — top-center toast. On load_finished(ok=true):
  'Welcome back — N minutes/hours away' for 5s + 0.8s fade.
  On ok=false: 'Load failed (corrupt or version mismatch)'.
- Strings catalog: 14 new keys (ui.save / ui.load / ui.welcome_back_* /
  ui.load_failed etc.)
- main.gd mounts LoadMenu + ResumeToast as runtime CanvasLayer children

MCP runtime verified:
- Saved at tick 1137 → [save] wrote slot 'manual': 113 entities at tick 1137
- Advanced sim to tick 4600 at ULTRA speed (different state)
- load_from_slot(&manual) → [save] applied slot 'manual': 113 entities,
  0 errors, tick=1137, away=34s
- post-load: Sim.tick=1137 (restored), pawns alive=3, all furniture +
  workbenches + crops + walls + floors back in place
- Resume toast fires: [resume_toast] showing — ok=true seconds_away=34
- Autosave on focus-loss verified: [autosave] focus-loss → wrote autosave
- Screenshot shows TopBar with Save + Load buttons + post-load Lone Wolf
  storyteller modal from fresh dawn roll

Known acceptable gaps (deferred to Phase 20 tuning):
- Pawn JobRunner mid-INTERACT/mid-BUILD restarts from toil 0 on reload
  (walk toil round-trips; multi-step interact does not). Pawns lose a few
  seconds of work.
- Workbench bill mid-craft fetch state isn't fully serialized.
- Wolf.target_pawn re-resolution from name string is Agent A's documented
  pattern; Agent B's apply_save respects pawn-restoration ordering so the
  resolution works after pawns are back.

Delegation: 3× gdscript-refactor (Sonnet) agents in parallel; integration
+ MCP verify on Opus.

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

scenes/entities/wolf.gd

@@ -177,6 +177,47 @@ func _advance_walk() -> void:
 		_step_progress = 0.0
 
 
+# ── save / load ──────────────────────────────────────────────────────────────
+
+func to_dict() -> Dictionary:
+	# target_pawn is stored as a name string so the loader can re-resolve it
+	# against World.pawns without a live Node reference.
+	var target_name: String = ""
+	if target_pawn != null and target_pawn.get("pawn_name") != null:
+		target_name = str(target_pawn.pawn_name)
+	var path_data: Array = []
+	for v in _path:
+		path_data.append([v.x, v.y])
+	return {
+		"class_id": &"wolf",
+		"tile_x": tile.x,
+		"tile_y": tile.y,
+		"hp": hp,
+		"state": int(state),
+		"step_progress": _step_progress,
+		"attack_cooldown": _attack_cooldown,
+		"target_pawn_name": target_name,
+		"path": path_data,
+	}
+
+
+func from_dict(d: Dictionary) -> void:
+	tile = Vector2i(int(d.get("tile_x", 0)), int(d.get("tile_y", 0)))
+	hp = clampf(float(d.get("hp", HP_MAX)), 0.0, HP_MAX)
+	state = int(d.get("state", State.APPROACH)) as State
+	_step_progress = float(d.get("step_progress", 0.0))
+	_attack_cooldown = int(d.get("attack_cooldown", 0))
+	# target_pawn: re-resolved by the loader after all pawns are restored.
+	# Store the name in a temporary string; caller sets target_pawn post-load.
+	target_pawn = null   # caller must re-resolve from "target_pawn_name"
+	_path.clear()
+	for entry in d.get("path", []):
+		if entry is Array and entry.size() == 2:
+			_path.append(Vector2i(int(entry[0]), int(entry[1])))
+	position = _tile_to_world(tile)
+	queue_redraw()
+
+
 # ── render ──────────────────────────────────────────────────────────────────
 
 func _process(_delta: float) -> void: