feat: expand keyword routing vocabulary for better agent selection

Add missing keywords: gear, bearing, flange, heatsink, bolt, shaft,
surface finish, drill, tap, endmill, bracket, housing, etc.
Includes 7 new routing tests verifying the improvements.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agents/prompts.py

@@ -162,18 +162,24 @@ def parse_mentions(message: str) -> tuple[str, list[str]]:
 _ROUTING_KEYWORDS: dict[str, list[str]] = {
     "design": [
         "design", "look", "shape", "style", "form", "aesthetic", "appearance",
-        "layout", "concept", "idea", "propose", "suggest",
+        "layout", "concept", "idea", "propose", "suggest", "bracket", "mount",
+        "enclosure", "housing", "ergonomic", "profile", "contour",
     ],
     "engineering": [
         "dimension", "tolerance", "material", "strength", "load", "stress",
         "thickness", "wall", "fillet", "radius", "clearance",
         "m2", "m3", "m4", "m5", "m6", "m8", "m10", "m12",
         "aluminum", "steel", "brass", "titanium", "nylon",
+        "gear", "bearing", "flange", "heatsink", "fin", "rib",
+        "bolt", "screw", "thread", "torque", "deflection",
+        "hole", "bore", "shaft", "keyway", "spline",
     ],
     "cnc": [
         "machine", "mill", "cnc", "manufacture", "machinable", "axis",
         "tool", "fixture", "setup", "pocket", "undercut", "access",
-        "3-axis", "5-axis", "cost",
+        "3-axis", "5-axis", "cost", "surface finish", "roughness",
+        "endmill", "drill", "tap", "chamfer tool", "deburr",
+        "setup count", "cycle time", "tolerance class",
     ],
     "cad": CAD_TRIGGER_KEYWORDS,
 }

tests/test_prompts.py

@@ -179,3 +179,38 @@ class TestBuildChatMessages:
         user_content = msgs[1]["content"]
         assert "msg 49" in user_content
         assert "msg 0" not in user_content
+
+
+# ── Improved routing coverage ───────────────────────���─────────────────────
+
+
+class TestRouteByKeywordsImproved:
+    """Tests for expanded keyword routing vocabulary."""
+
+    def test_gear_routes_to_engineering(self):
+        agents = route_by_keywords("I need a spur gear with 20 teeth")
+        assert "engineering" in agents
+
+    def test_bearing_routes_to_engineering(self):
+        agents = route_by_keywords("Design a bearing housing")
+        assert "engineering" in agents
+
+    def test_heatsink_routes_to_engineering(self):
+        agents = route_by_keywords("Create a heatsink with fins")
+        assert "engineering" in agents
+
+    def test_flange_routes_to_engineering(self):
+        agents = route_by_keywords("A pipe flange with bolt holes")
+        assert "engineering" in agents
+
+    def test_servo_bracket_routes_to_design(self):
+        agents = route_by_keywords("Design a servo bracket for a camera gimbal")
+        assert "design" in agents
+
+    def test_cost_routes_to_cnc(self):
+        agents = route_by_keywords("How much would this cost to machine?")
+        assert "cnc" in agents
+
+    def test_surface_finish_routes_to_cnc(self):
+        agents = route_by_keywords("What surface finish can we achieve?")
+        assert "cnc" in agents