feat(web): ship per-turn replay frames in the memory payload

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

proteus/web/server.py

@@ -121,10 +121,16 @@ def _memory_info(session) -> dict:
         "turns": (len(mem.memory_turns) if mem else 0),
         "persona": (mem.persona_weight_id if mem else None),
         "block": None,
+        "frames": [],
     }
     if mem is not None:
-        from proteus.runtime.memory import render_memory_block
+        from proteus.grid.scenario import get_scenario
+        from proteus.runtime.memory import memory_frames, render_memory_block
         info["block"] = render_memory_block(mem)
+        scen = get_scenario(mem.scenario)()
+        info["frames"] = memory_frames(
+            mem, legend=scen.legend(), grid_size=scen.grid_size,
+        )
     return info
 
 

tests/web/test_memory_modes.py

@@ -82,3 +82,25 @@ def test_response_carries_rendered_memory_block_for_display():
     _, none, _ = server.handle_request(
         "POST", "/session", {"scenario": "predator_evade", "memory": "none"}, _reg())
     assert none["memory"]["block"] is None
+
+
+def test_memory_payload_includes_replay_frames_for_pack_evade():
+    _, payload, _ = server.handle_request(
+        "POST", "/session",
+        {"scenario": "pack_evade", "seed": 42, "play_turns": 3, "memory": "default"},
+        _reg())
+    frames = payload["memory"]["frames"]
+    assert isinstance(frames, list) and len(frames) >= 1
+    f0 = frames[0]
+    assert set(f0) == {"turn_idx", "action", "grid"}
+    assert len(f0["grid"]) == 64 and len(f0["grid"][0]) == 64  # 64x64 field
+    assert any(3 in row for row in f0["grid"])  # walls present
+
+
+def test_memory_frames_empty_when_no_memory():
+    _, payload, _ = server.handle_request(
+        "POST", "/session",
+        {"scenario": "pack_evade", "seed": 42, "play_turns": 3, "memory": "none"},
+        _reg())
+    assert payload["memory"]["attached"] is False
+    assert payload["memory"]["frames"] == []