feat(client): hair highlight swatch + manifest JSON for exports (#719, #720)

#719: Add display-only hair highlight swatch (Option B) — auto-derived
from primary tint, non-interactive (MOUSE_FILTER_IGNORE).

#720: Remove DirAccess.open() fallback scanning (breaks in PCK exports).
Fully populate manifest.json (11 body types, 14 hair, 4 heads, 4
eyebrows, 8 clothing). Add tooling/generate-character-manifest script
and make manifest target for regeneration.

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

client/assets/characters/manifest.json

@@ -1,13 +1,75 @@
 {
-  "body_types": ["average_m", "average_f", "muscular_m", "muscular_f", "teen_m", "teen_f"],
-  "heads": [],
-  "hair": ["bob", "buns", "buzzed", "long", "ponytail", "bald"],
-  "facial_hair": ["beard", "moustache", "mutton_chops"],
-  "eyebrows": [],
+  "body_types": [
+    "average_f",
+    "average_m",
+    "child",
+    "heavy_f",
+    "heavy_m",
+    "muscular_f",
+    "muscular_m",
+    "teen_f",
+    "teen_m",
+    "thin_f",
+    "thin_m"
+  ],
+  "heads": [
+    "head_001",
+    "head_002",
+    "head_003",
+    "head_004"
+  ],
+  "hair": [
+    "bald",
+    "balding",
+    "bob",
+    "buns",
+    "buzzed",
+    "buzzed_female",
+    "dreads",
+    "long",
+    "long_dreads",
+    "mohawk",
+    "ponytail",
+    "ponytail_f",
+    "simple_parted",
+    "slick_back"
+  ],
+  "facial_hair": [
+    "beard",
+    "moustache",
+    "mutton_chops"
+  ],
+  "eyebrows": [
+    "female",
+    "regular",
+    "teen",
+    "thick"
+  ],
   "clothing": {
-    "peasant_tunic": {"slot": "torso"},
-    "peasant_pants": {"slot": "legs"},
-    "peasant_shoes": {"slot": "feet"}
+    "boots_work": {
+      "slot": "feet"
+    },
+    "coveralls_basic": {
+      "slot": "torso"
+    },
+    "jacket_utility": {
+      "slot": "torso"
+    },
+    "pants_cargo": {
+      "slot": "legs"
+    },
+    "peasant_pants": {
+      "slot": "legs"
+    },
+    "peasant_shoes": {
+      "slot": "feet"
+    },
+    "peasant_tunic": {
+      "slot": "torso"
+    },
+    "shirt_henley": {
+      "slot": "torso"
+    }
   },
   "accessories": []
 }

client/ui/character_creation.gd

@@ -669,6 +669,11 @@ func _build_hair_color_dock() -> Control:
 		func(c): _on_hair_primary_changed(c))
 	row.add_child(_hair_primary_swatch)
 
+	# #719 (Option B): highlight is auto-derived from primary — display-only, not editable.
+	_hair_highlight_swatch = _make_display_swatch(
+		_derive_hair_highlight(_descriptor.hair_tint), "Highlight")
+	row.add_child(_hair_highlight_swatch)
+
 	_eyebrow_tint_swatch = _make_color_swatch(_descriptor.hair_tint, "Brows ●",
 		func(c): _on_eyebrow_tint_changed(c))
 	row.add_child(_eyebrow_tint_swatch)
@@ -1840,45 +1845,6 @@ func _apply_search_filter(grid: GridContainer, query: String) -> void:
 			child.visible = lower_q.is_empty() or (child as Button).text.to_lower().contains(lower_q)
 
 
-# =============================================================================
-# Asset scanning helpers
-# =============================================================================
-
-## Scan a directory for subdirectory names (item_id directories like clothing/coveralls_basic/).
-## Returns fallback list if the directory is absent or empty.
-## TODO: replace with manifest JSON for export builds (DirAccess won't list res:// in PCK).
-static func _scan_subdirs(dir_path: String, fallback: Array) -> Array:
-	var dir := DirAccess.open(dir_path)
-	if dir == null:
-		return fallback
-	var ids: Array = []
-	dir.list_dir_begin()
-	var name := dir.get_next()
-	while name != "":
-		if dir.current_is_dir() and not name.begins_with("."):
-			ids.append(name)
-		name = dir.get_next()
-	dir.list_dir_end()
-	return ids if not ids.is_empty() else fallback
-
-
-## Scan a directory for .glb asset IDs. Returns fallback list if directory absent.
-## TODO: replace with manifest JSON for export builds (DirAccess won't list res:// in PCK).
-static func _scan_asset_ids(dir_path: String, ext: String, fallback: Array) -> Array:
-	var dir := DirAccess.open(dir_path)
-	if dir == null:
-		return fallback
-	var ids: Array = []
-	dir.list_dir_begin()
-	var name := dir.get_next()
-	while name != "":
-		if not dir.current_is_dir() and name.ends_with(ext):
-			ids.append(name.get_basename())
-		name = dir.get_next()
-	dir.list_dir_end()
-	return ids if not ids.is_empty() else fallback
-
-
 func _get_clothing_ids_for_slot(slot: String) -> Array:
 	# Clothing items from manifest — slot assignment is explicit, not prefix-based.
 	var clothing_data: Variant = _manifest.get("clothing", {})