chore: remove container legacy references

- Delete container/build.sh (Docker build script, no longer used)
- Remove "auth" npm script (whatsapp-auth.ts doesn't exist)
- Remove CONTAINER_* env var fallbacks from config.ts
- Update CLAUDE.md: container-runner → agent-runner, fix descriptions
- Rename MAX_CONCURRENT_CONTAINERS → MAX_CONCURRENT_AGENTS in systemd

src/config.ts

@@ -33,25 +33,21 @@ export const DATA_DIR = path.resolve(
 );
 
 export const AGENT_TIMEOUT = parseInt(
-  process.env.AGENT_TIMEOUT || process.env.CONTAINER_TIMEOUT || '1800000',
+  process.env.AGENT_TIMEOUT || '1800000',
   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 || '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 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 || '5', 10) || 5,
 );
 
 function escapeRegex(str: string): string {