Add context_mode option for scheduled tasks

Scheduled tasks can now run in either:
- "group" mode: uses the group's conversation session for context
- "isolated" mode: runs with a fresh session (previous behavior)

The tool description guides the agent on when to use each mode and
prompts them to ask the user if unclear. Group mode is now the default.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

container/agent-runner/src/ipc-mcp.ts

@@ -70,14 +70,25 @@ export function createIpcMcp(ctx: IpcMcpContext) {
         'schedule_task',
         `Schedule a recurring or one-time task. The task will run as a full agent with access to all tools.
 
-IMPORTANT - schedule_value format depends on schedule_type:
+CONTEXT MODE - Choose based on task type:
+• "group" (recommended for most tasks): Task runs in the group's conversation context, with access to chat history and memory. Use for tasks that need context about ongoing discussions, user preferences, or previous interactions.
+• "isolated": Task runs in a fresh session with no conversation history. Use for independent tasks that don't need prior context. When using isolated mode, include all necessary context in the prompt itself.
+
+If unsure which mode to use, ask the user. Examples:
+- "Remind me about our discussion" → group (needs conversation context)
+- "Check the weather every morning" → isolated (self-contained task)
+- "Follow up on my request" → group (needs to know what was requested)
+- "Generate a daily report" → isolated (just needs instructions in prompt)
+
+SCHEDULE VALUE FORMAT:
 • cron: Standard cron expression (e.g., "*/5 * * * *" for every 5 minutes, "0 9 * * *" for daily at 9am)
 • interval: Milliseconds between runs (e.g., "300000" for 5 minutes, "3600000" for 1 hour)
 • once: ISO 8601 timestamp (e.g., "2026-02-01T15:30:00.000Z"). Calculate this from current time.`,
         {
-          prompt: z.string().describe('What the agent should do when the task runs'),
+          prompt: z.string().describe('What the agent should do when the task runs. For isolated mode, include all necessary context here.'),
           schedule_type: z.enum(['cron', 'interval', 'once']).describe('cron=recurring at specific times, interval=recurring every N ms, once=run once at specific time'),
           schedule_value: z.string().describe('cron: "*/5 * * * *" | interval: milliseconds like "300000" | once: ISO timestamp like "2026-02-01T15:30:00.000Z"'),
+          context_mode: z.enum(['group', 'isolated']).default('group').describe('group=runs with chat history and memory, isolated=fresh session (include context in prompt)'),
           target_group: z.string().optional().describe('Target group folder (main only, defaults to current group)')
         },
         async (args) => {
@@ -117,6 +128,7 @@ IMPORTANT - schedule_value format depends on schedule_type:
             prompt: args.prompt,
             schedule_type: args.schedule_type,
             schedule_value: args.schedule_value,
+            context_mode: args.context_mode || 'group',
             groupFolder: targetGroup,
             chatJid,
             createdBy: groupFolder,