feat(agent): cross-char search_items tool + bump timeouts

Adds an MCP tool wrapping the inventory-service /search/items endpoint
with include_all_characters=true, so questions like 'find me a bracelet
with Legendary Acid Ward on any unequipped char' resolve in ONE tool call
instead of looping get_inventory over 60+ chars (which timed out at 120s).

- agent/tools.py: search_items_global wrapper
- agent/mcp_overlord.py: register new tool with detailed schema doc
- agent/claude_wrapper.py: include in --allowed-tools whitelist;
  bump timeout 120s -> 240s
- nginx/overlord.conf: bump /api/agent/ proxy timeout 180s -> 300s
- CLAUDE.md: brief Claude to USE search_items for cross-char searches

agent/mcp_overlord.py

@@ -127,10 +127,8 @@ TOOL_DEFS: dict[str, dict[str, Any]] = {
     },
     "get_inventory_search": {
         "description": (
-            "Filtered inventory search for one character. Pass filter query "
-            "params as the `filters` object. Common filters: name (substring), "
-            "armor_level_min, armor_level_max, material, item_set, has_spell. "
-            "Returns matching items in the same shape as get_inventory."
+            "Filtered inventory search for ONE character. Use search_items "
+            "instead when the user wants to find something across ALL chars."
         ),
         "schema": {
             "type": "object",
@@ -147,6 +145,39 @@ TOOL_DEFS: dict[str, dict[str, Any]] = {
             str(args["character_name"]), args.get("filters") or {}
         ),
     },
+    "search_items": {
+        "description": (
+            "CROSS-CHARACTER item search — one query that scans every "
+            "character's inventory. Use this whenever the user asks "
+            "'find me an X on any of my chars'. **Do not** iterate "
+            "get_inventory per character — this single tool call is far "
+            "faster and avoids agent timeouts.\n\n"
+            "Filter keys (pass as `filters` object, all optional):\n"
+            "  include_all_characters: true  (default if no scope given)\n"
+            "  character: 'Name'             (single char)\n"
+            "  characters: 'A,B,C'           (specific list, comma-separated)\n"
+            "  text: substring of item name/description\n"
+            "  has_spell: 'Legendary Acid Ward'   (exact spell name match)\n"
+            "  spell_contains: 'Legendary'        (substring)\n"
+            "  legendary_cantrips: 'Foo,Bar'\n"
+            "  equipment_status: 'equipped' | 'unequipped'\n"
+            "  equipment_slot: int bitmask (4=chest, 2048=bracelet, 4096=ring)\n"
+            "  slot_names: 'Bracelet,Ring'\n"
+            "  armor_only / jewelry_only / weapon_only: bool\n"
+            "  min_armor / max_armor / min_damage / max_damage: int\n"
+        ),
+        "schema": {
+            "type": "object",
+            "required": ["filters"],
+            "properties": {
+                "filters": {
+                    "type": "object",
+                    "description": "Query params dict — see tool description for keys.",
+                },
+            },
+        },
+        "fn": lambda args: T.search_items_global(args.get("filters") or {}),
+    },
     "get_combat_stats": {
         "description": (
             "Lifetime + session combat stats for one character. Includes total "