chore: cargo fmt --all — clean up a2a merge's fmt violations

The a2a merge (d0d8e7f) landed with a handful of pre-existing rustfmt
diffs that were failing `cargo fmt --all --check` in CI. Pure whitespace
reformatting from `cargo fmt --all`; no semantic changes. Files touched:
mcp_door.rs, quota.rs, routes/a2a.rs, routes/world.rs, runtime_provision.rs,
chat_repos.rs test, and tools/chat.rs.

crates/cm-api/src/mcp_door.rs

@@ -244,7 +244,10 @@ async fn caller_agent(
     user: &cm_auth::AuthedUser,
     headers: &HeaderMap,
 ) -> Result<cm_domain::AgentId, String> {
-    if let Some(alias) = headers.get("x-zeroclaw-agent").and_then(|v| v.to_str().ok()) {
+    if let Some(alias) = headers
+        .get("x-zeroclaw-agent")
+        .and_then(|v| v.to_str().ok())
+    {
         if let Some(hex) = alias.strip_prefix("claw_") {
             if let Ok(uuid) = uuid::Uuid::parse_str(hex) {
                 let agent_id = cm_domain::AgentId::from(uuid);
@@ -277,10 +280,18 @@ async fn delegate_call(
     args: &Value,
     id: Option<Value>,
 ) -> Json<Value> {
-    let Some(to) = args.get("to").and_then(|v| v.as_str()).filter(|s| !s.is_empty()) else {
+    let Some(to) = args
+        .get("to")
+        .and_then(|v| v.as_str())
+        .filter(|s| !s.is_empty())
+    else {
         return tool_result(id, true, "delegate: missing 'to' (target claw name)".into());
     };
-    let Some(task) = args.get("task").and_then(|v| v.as_str()).filter(|s| !s.is_empty()) else {
+    let Some(task) = args
+        .get("task")
+        .and_then(|v| v.as_str())
+        .filter(|s| !s.is_empty())
+    else {
         return tool_result(id, true, "delegate: missing 'task'".into());
     };
     let context: Vec<String> = args
@@ -296,10 +307,20 @@ async fn delegate_call(
     // Resolve the target claw by name within the workspace.
     let target = match cm_db::repo::agents::roster(&state.pool, user.workspace_id).await {
         Ok(roster) => roster.into_iter().find(|a| a.name.eq_ignore_ascii_case(to)),
-        Err(_) => return tool_result(id, true, "delegate: failed to resolve workspace roster".into()),
+        Err(_) => {
+            return tool_result(
+                id,
+                true,
+                "delegate: failed to resolve workspace roster".into(),
+            )
+        }
     };
     let Some(target) = target else {
-        return tool_result(id, true, format!("delegate: no claw named {to:?} in this workspace"));
+        return tool_result(
+            id,
+            true,
+            format!("delegate: no claw named {to:?} in this workspace"),
+        );
     };
     if target.id == caller {
         return tool_result(id, true, "delegate: cannot delegate to yourself".into());