fix: read heartbeat target from per-agent config (#292)

src/config/types.ts

@@ -56,6 +56,7 @@ export interface AgentConfig {
       skipRecentUserMin?: number; // Skip auto-heartbeats for N minutes after user message (0 disables)
       prompt?: string;       // Custom heartbeat prompt (replaces default body)
       promptFile?: string;   // Path to prompt file (re-read each tick for live editing)
+      target?: string;       // Delivery target ("telegram:123", "slack:C123", etc.)
     };
     maxToolCalls?: number;
   };
@@ -120,6 +121,7 @@ export interface LettaBotConfig {
       skipRecentUserMin?: number; // Skip auto-heartbeats for N minutes after user message (0 disables)
       prompt?: string;       // Custom heartbeat prompt (replaces default body)
       promptFile?: string;   // Path to prompt file (re-read each tick for live editing)
+      target?: string;       // Delivery target ("telegram:123", "slack:C123", etc.)
     };
     inlineImages?: boolean;   // Send images directly to the LLM (default: true). Set false to only send file paths.
     maxToolCalls?: number;  // Abort if agent calls this many tools in one turn (default: 100)

src/main.ts

@@ -605,7 +605,7 @@ async function main() {
       prompt: heartbeatConfig?.prompt || process.env.HEARTBEAT_PROMPT,
       promptFile: heartbeatConfig?.promptFile,
       workingDir: globalConfig.workingDir,
-      target: parseHeartbeatTarget(process.env.HEARTBEAT_TARGET),
+      target: parseHeartbeatTarget(heartbeatConfig?.target) || parseHeartbeatTarget(process.env.HEARTBEAT_TARGET),
     });
     if (heartbeatConfig?.enabled) {
       heartbeatService.start();