feat: buildable list, building interaction API (toggle/set_recipe/empty/cancel)

New endpoints:
- GET /api/state/buildable: buildings filtered by completed research (unlocked/locked)
- POST /api/action/toggle: toggle building on/off (save power, control workflow)
- POST /api/action/set_recipe: set building recipe (e.g. Rock Crusher mode)
- POST /api/action/empty: empty building storage (drop all contents)
- POST /api/action/cancel_errand: cancel all errands at a building

Improved research: proper prerequisite validation, tech queueing, research station check

CLI: buildable [filter], toggle, set_recipe, empty, cancel_errand
Updated SKILL.md with new endpoint docs

tools/oni_api.py

@@ -792,6 +792,65 @@ def _print_feedback(result):
         if sug:
             print(f"  -> {sug}")
 
+# ---------------------------------------------------------------------------
+# Buildable / Research / Building Interaction
+# ---------------------------------------------------------------------------
+
+def cmd_buildable(args):
+    """List all buildable buildings. Usage: buildable [filter]"""
+    filt = args[0].lower() if args else ""
+    data = api_get('/api/state/buildable')
+    if 'error' in data:
+        print(f"Error: {data['error']}")
+        return
+    total = data.get('total', 0)
+    unlocked = data.get('unlocked', 0)
+    print(f"Buildings: {unlocked}/{total} unlocked")
+    print()
+    for b in data.get('buildings', []):
+        name = b.get('name', '?')
+        bid = b.get('id', '')
+        if filt and filt not in name.lower() and filt not in bid.lower():
+            continue
+        mark = "✓" if b.get('unlocked') else "✗"
+        cat = b.get('category', '?')
+        pw = f" {b.get('powerCost', 0)}W" if b.get('powerCost', 0) > 0 else ""
+        print(f"  [{mark}] {name:30s} {bid:30s} {cat:15s}{pw}")
+
+def cmd_toggle(args):
+    """Toggle building on/off. Usage: toggle <x> <y>"""
+    if len(args) < 2:
+        print("Usage: toggle <x> <y>")
+        return
+    result = api_post('/api/action/toggle', {"x": int(args[0]), "y": int(args[1])})
+    _print_feedback(result)
+
+def cmd_set_recipe(args):
+    """Set a building's recipe. Usage: set_recipe <x> <y> <recipeId>"""
+    if len(args) < 3:
+        print("Usage: set_recipe <x> <y> <recipeId>")
+        return
+    result = api_post('/api/action/set_recipe', {
+        "x": int(args[0]), "y": int(args[1]), "recipeId": args[2]
+    })
+    _print_feedback(result)
+
+def cmd_empty(args):
+    """Empty a building's storage. Usage: empty <x> <y>"""
+    if len(args) < 2:
+        print("Usage: empty <x> <y>")
+        return
+    result = api_post('/api/action/empty', {"x": int(args[0]), "y": int(args[1])})
+    _print_feedback(result)
+
+def cmd_cancel_errand(args):
+    """Cancel errands at a building. Usage: cancel_errand <x> <y>"""
+    if len(args) < 2:
+        print("Usage: cancel_errand <x> <y>")
+        return
+    result = api_post('/api/action/cancel_errand', {"x": int(args[0]), "y": int(args[1])})
+    _print_feedback(result)
+
 # ---------------------------------------------------------------------------
 # Screenshot / Camera
 # ---------------------------------------------------------------------------
@@ -956,6 +1015,11 @@ COMMANDS = {
     'snapshot': cmd_snapshot,
     'camera': cmd_camera,
     'camera_status': cmd_camera_status,
+    'buildable': cmd_buildable,
+    'toggle': cmd_toggle,
+    'set_recipe': cmd_set_recipe,
+    'empty': cmd_empty,
+    'cancel_errand': cmd_cancel_errand,
 }
 
 if __name__ == '__main__':
@@ -994,14 +1058,16 @@ if __name__ == '__main__':
         print("  registry techs [f]       List all tech IDs with unlocks")
         print("  registry priorities      Show priority level meanings")
         print("")
-        print("=== Actions ===")
-        print("  dig <x> <y> <w> <h>      Dig area")
-        print("  build <id> <x> <y>       Place building")
-        print("  deconstruct <id> <x> <y> Remove building")
-        print("  prioritize <x> <y> <p>   Set priority")
-        print("  research_select <id>     Select tech to research")
-        print("  mop <x> <y>              Mop liquid")
-        print("  harvest <x> <y>          Harvest plant")
+        print("=== Building Interaction ===")
+        print("  toggle <x> <y>             Toggle building on/off")
+        print("  set_recipe <x> <y> <id>    Set building recipe")
+        print("  empty <x> <y>              Empty building storage")
+        print("  cancel_errand <x> <y>      Cancel errands at building")
+        print("")
+        print("=== Research / Buildable ===")
+        print("  buildable [filter]         List buildings unlocked by current research")
+        print("  research_select <id>       Select tech to research")
+        print("  research                   Show research tree progress")
         print("")
         print("=== Game Speed Control ===")
         print("  pause [reason]           Pause the game (AI should always pause before ops)")