chore: apply oxlint autofix (safe level)

Auto-fixed 102 warnings (6040 → 5938) across 57 files. Main categories:
- preserve-caught-error: add { cause: error } to re-thrown errors
- unicorn/no-array-reverse: .reverse() → .toReversed()
- unicorn/no-useless-fallback-in-spread: drop unnecessary ?? {} in spreads
- oxc/no-map-spread: rewrite object spread in .map() to Object.assign
- react-hooks/exhaustive-deps: trim module-level constants from dep arrays

Ran npm run format after to clean up whitespace from lint mutations.

packages/server/src/server/agent/mcp-server.ts

@@ -666,8 +666,8 @@ export async function createAgentMcpServer(options: AgentMcpServerOptions): Prom
       const childAgentDefaultLabels = callerContext?.childAgentDefaultLabels;
       const mergedLabels = {
         ...(callerAgentId ? { "paseo.parent-agent-id": callerAgentId } : {}),
-        ...(childAgentDefaultLabels ?? {}),
-        ...(labels ?? {}),
+        ...childAgentDefaultLabels,
+        ...labels,
       };
       const snapshot = await agentManager.createAgent(
         {