huskies: merge 1163 story Replace perm_rx lock-as-presence-signal with a permission router

server/src/http/gateway/mcp.rs

@@ -24,7 +24,7 @@ const GATEWAY_TOOLS: &[&str] = &[
     "adopt_project",
     "aggregate_pipeline_status",
     "agents.list",
-    // Handled at the gateway so the Matrix bot's perm_rx listener is used
+    // Handled at the gateway so the Matrix bot's permission listener is used
     // rather than the container's (which has no interactive session attached).
     "prompt_permission",
     // One-shot container rebuild: build fresh image, swap container, preserve state.
@@ -764,9 +764,9 @@ async fn handle_aggregate_pipeline_status_tool(
 /// Handle the `prompt_permission` tool at the gateway level.
 ///
 /// Mirrors `tool_prompt_permission` in `http/mcp/diagnostics/permission.rs` but
-/// uses the gateway's `perm_tx`/`perm_rx` so requests reach the Matrix bot that
-/// is listening on the gateway, not the proxied container (which has no
-/// interactive session and would auto-deny immediately).
+/// uses the gateway's `perm_tx`/`permission_registry` so requests reach the
+/// Matrix bot that is listening on the gateway, not the proxied container
+/// (which has no interactive session and would auto-deny immediately).
 async fn handle_prompt_permission_tool(
     params: &Value,
     state: &GatewayState,
@@ -792,9 +792,9 @@ async fn handle_prompt_permission_tool(
         return JsonRpcResponse::success(id, json!({"content": [{"type": "text", "text": text}]}));
     }
 
-    // Auto-deny when no interactive session holds perm_rx (i.e. no Matrix bot
-    // listener is running — try_lock succeeds when nobody else holds the lock).
-    if state.perm_rx.try_lock().is_ok() {
+    // Auto-deny when no responder is registered (i.e. no Matrix bot listener
+    // is running).
+    if state.permission_registry.is_empty() {
         crate::slog!("[gateway/permission] Auto-denied '{tool_name}' (no interactive session)");
         let text = json!({
             "behavior": "deny",