refactor: unify skill sync, remove commands directory

- Remove commands/ sync from agent-runner (skills/ is SSOT for both agents)
- Remove ~/.codex/skills/ as source (use ~/.claude/skills/ only)
- Codex uses $skill prefix, Claude Code uses /skill — both read from skills/
- Minor formatting fixes in config.ts, group-queue.test.ts, index.ts

src/config.ts

@@ -37,14 +37,21 @@ export const AGENT_TIMEOUT = parseInt(
   10,
 );
 export const AGENT_MAX_OUTPUT_SIZE = parseInt(
-  process.env.AGENT_MAX_OUTPUT_SIZE || process.env.CONTAINER_MAX_OUTPUT_SIZE || '10485760',
+  process.env.AGENT_MAX_OUTPUT_SIZE ||
+    process.env.CONTAINER_MAX_OUTPUT_SIZE ||
+    '10485760',
   10,
 ); // 10MB default
 export const IPC_POLL_INTERVAL = 1000;
 export const IDLE_TIMEOUT = parseInt(process.env.IDLE_TIMEOUT || '1800000', 10); // 30min default — how long to keep agent alive after last result
 export const MAX_CONCURRENT_AGENTS = Math.max(
   1,
-  parseInt(process.env.MAX_CONCURRENT_AGENTS || process.env.MAX_CONCURRENT_CONTAINERS || '5', 10) || 5,
+  parseInt(
+    process.env.MAX_CONCURRENT_AGENTS ||
+      process.env.MAX_CONCURRENT_CONTAINERS ||
+      '5',
+    10,
+  ) || 5,
 );
 
 function escapeRegex(str: string): string {