fix(turn): preserve complete signed host actions

loopx/control_plane/quota/turn_envelope.ts

@@ -602,11 +602,14 @@ function actionProjection(payload: JsonObject, protocolActionFields: JsonObject)
   const recommendedAction = replanPacket
     ? "apply replan_action_packet and emit one required semantic outcome"
     : text(turn.observation.recommended_action || payload.recommended_action, 480);
+  // The signed host action is executable authority, not a display summary.
+  // Budget diagnostics may warn on long commands but must not cut them.
+  const primaryAction = scalarString(agentChannel.primary_action, "agent_channel.primary_action").trim();
   const action: JsonObject = {
     recommended_action: recommendedAction,
     primary_action: replanPacket
       ? "produce one required semantic outcome"
-      : text(agentChannel.primary_action, 480),
+      : primaryAction || null,
     must_attempt: Boolean(agentChannel.must_attempt),
     delivery_allowed: Boolean(agentChannel.delivery_allowed),
     quiet_noop_allowed: Boolean(agentChannel.quiet_noop_allowed),

loopx/control_plane/turn_driver/host_candidate.py

@@ -75,11 +75,8 @@ def extract_turn_authority(request: Mapping[str, Any]) -> dict[str, Any]:
         raise ValueError("TurnEnvelope action signature is missing or does not match")
 
     action = _mapping(envelope.get("action"))
-    primary_action = _bounded(
-        action.get("primary_action"),
-        limit=TEXT_LIMITS["recommended_action"],
-    )
-    if not primary_action:
+    primary_action = action.get("primary_action")
+    if not isinstance(primary_action, str) or not primary_action.strip():
         raise ValueError("signed TurnEnvelope has no primary_action")
 
     boundary = _mapping(envelope.get("boundary"))

tests/test_turn_envelope.py

@@ -909,6 +909,28 @@ def test_protocol_packet_derivation_retains_unverified_summary() -> None:
     assert packet["summary"] == "legacy opaque packet"
 
 
+@pytest.mark.parametrize("path_segments", [170, 1_500])
+def test_signed_host_action_preserves_a_long_complete_command(
+    path_segments: int,
+) -> None:
+    source = _compat_decision("absent")
+    command = (
+        "loopx quota should-run --registry /"
+        + "project/" * path_segments
+        + " --codex-app"
+    )
+    assert len(command) > 1_200
+    source["interaction_contract"]["agent_channel"]["primary_action"] = command
+
+    envelope = build_turn_envelope(source)
+
+    assert envelope["action_signature"]["matches"] is True
+    assert envelope["action"]["primary_action"] == command
+    assert extract_turn_authority({"turn_envelope": envelope})["primary_action"] == command
+    if path_segments == 1_500:
+        assert envelope["compaction"]["within_budget"] is False
+
+
 @pytest.mark.parametrize("packet_format", ["absent", "historical_v0", "opaque", "residue"])
 def test_protocol_packet_compatibility_through_real_readers(packet_format: str) -> None:
     """The summary is an observation; the typed decision owns execution."""