refactor: rename container references to agent across codebase

- container-runner.ts → agent-runner.ts
- ContainerInput/Output → AgentInput/Output
- ContainerConfig → AgentConfig
- runContainerAgent → runAgentProcess
- CONTAINER_TIMEOUT → AGENT_TIMEOUT (with env fallback)
- MAX_CONCURRENT_CONTAINERS → MAX_CONCURRENT_AGENTS
- containerName → processName, isTaskContainer → isTaskProcess
- DB column container_config kept as-is (backwards compat)

src/types.ts

@@ -4,7 +4,7 @@ export interface AdditionalMount {
   readonly?: boolean; // Default: true for safety
 }
 
-export interface ContainerConfig {
+export interface AgentConfig {
   additionalMounts?: AdditionalMount[];
   timeout?: number; // Default: 300000 (5 minutes)
   // Per-group model/effort overrides (take precedence over global env vars)
@@ -21,7 +21,7 @@ export interface RegisteredGroup {
   folder: string;
   trigger: string;
   added_at: string;
-  containerConfig?: ContainerConfig;
+  agentConfig?: AgentConfig;
   requiresTrigger?: boolean; // Default: true for groups, false for solo chats
   isMain?: boolean; // True for the main control group (no trigger, elevated privileges)
   agentType?: AgentType;