fix: resolve lint errors (unused vars, imports, formatting)

- Prefix unused test variables with underscore
- Remove unused piSpec import and idleMs class member
- Fix import ordering and code formatting

src/process/tau-rpc.ts

@@ -1,8 +1,6 @@
 import { type ChildProcessWithoutNullStreams, spawn } from "node:child_process";
 import readline from "node:readline";
 
-import { piSpec } from "../agents/pi.js";
-
 type TauRpcOptions = {
   argv: string[];
   cwd?: string;
@@ -24,7 +22,6 @@ class TauRpcClient {
   private stderr = "";
   private buffer: string[] = [];
   private idleTimer: NodeJS.Timeout | null = null;
-  private readonly idleMs = 120;
   private pending:
     | {
         resolve: (r: TauRpcResult) => void;
@@ -58,7 +55,12 @@ class TauRpcClient {
         const out = this.buffer.join("\n");
         clearTimeout(pending.timer);
         // Treat process exit as completion with whatever output we captured.
-        pending.resolve({ stdout: out, stderr: this.stderr, code: code ?? 0, signal });
+        pending.resolve({
+          stdout: out,
+          stderr: this.stderr,
+          code: code ?? 0,
+          signal,
+        });
       }
       this.dispose();
     });