Add STS2MCP HTTP client and state capture tool

sts2.py: thin client for the mod's localhost HTTP API, maps
state_type -> legal actions (the action space), strict
observe -> act once -> observe-again loop.
capture.py: manual state snapshot tool for building facts.py.

capture.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+"""Save game state snapshots to ./capture/<label>.json while building facts.py.
+
+usage: python3 capture.py <label> [--wait SECONDS]
+"""
+import json, sys, time, pathlib
+sys.path.insert(0, str(pathlib.Path(__file__).parent))
+import sts2
+
+def snap(label, wait=1.0):
+    if wait: time.sleep(wait)
+    obs = sts2.state()
+    out = pathlib.Path(__file__).parent / "capture"
+    out.mkdir(exist_ok=True)
+    path = out / f"{label}.json"
+    path.write_text(json.dumps(obs, indent=2))
+    print(f"[{label}] state_type={obs.get('state_type')!r} "
+          f"msg={str(obs.get('message'))[:60]!r} -> {path.name} ({path.stat().st_size}B)")
+    return obs
+
+if __name__ == "__main__":
+    args = [a for a in sys.argv[1:] if not a.startswith("--")]
+    wait = 1.0
+    if "--wait" in sys.argv:
+        wait = float(sys.argv[sys.argv.index("--wait") + 1])
+    for lbl in args:
+        snap(lbl, wait)