search challenge: triangle marker on a crate's back face (rendered in vision, in digest), report tool with distance verification, smooth turn(duration), --free/--search autonomous modes, look_at crates; verified with gpt-5.6-luna

testbed/README.md

@@ -64,6 +64,25 @@ taken); stop the old one with `fuser -k 8765/tcp` or Ctrl-C in its terminal.
 The demo prints a full transcript of tool calls/results to stdout and saves the
 capsule's final first-person frame to `demo_final_frame.png`.
 
+### Search challenge
+
+A small orange triangle is painted on the **back side** of one of the crates
+(random per run, always on a face hidden from the spawn corner). The agent must
+explore the room, look at the crate faces, spot the triangle with `vision`,
+and `report` it (the bridge verifies the report by distance):
+
+```bash
+scripts/run_chat.sh --provider polza --search
+# autonomous exploration, real vision, smooth turns, cruise gliding;
+# success = report verified
+```
+
+Search missions run in `--free` mode: no re-aim corrections, no collision
+hints — the model plans its own exploration. `--free` also applies to beacon
+missions if you want fewer guardrails. `look_at` now accepts crates too
+(crate_red/crate_blue/crate_olive). Verified: gpt-5.6-luna explored the room
+with smooth moves/turns and reported the triangle at 0.5 m.
+
 ### Smooth & proactive movement
 
 The capsule no longer teleports or stops-and-thinks: