feat(agentic): add Multitask mode and improve subagent background delivery#762
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- add a shared session workspace resolver in the coordinator and session manager - let cron, session control, and session history infer workspace from session_id when possible - allow SessionMessage to create a new target session when session_id is omitted - tighten tool input validation and add regression tests for the new session workflows
- isolate session and subagent test temp workspaces with Drop cleanup - clean up temp repos used by function agent port adapter tests - clean up miniapp runtime and storage temp roots after tests - keep bitfun-core test runs from leaving bitfun-* directories in Temp
- persist agent_type on user dialog turns and cache the last surviving dialog mode in session state - restore and clear previous mode correctly during session reload and rollback so reminders reflect real mode transitions - share coding mode prompt/tool defaults and expose plan/debug helpers consistently across modes - add test coverage for persisted turn mode recovery and rollback-to-empty behavior
- add `run_in_background` support to Task tool and return a background task handle - generalize round steering into round injection for current-turn and exact-turn delivery - deliver background subagent results via steering when parent is running - start a new parent turn automatically when background results arrive while idle - wire scheduler/coordinator/execution engine to the new background delivery flow
…ult delivery - add builtin Multitask mode with agentic-equivalent tooling and multitask-specific reminders - surface Multitask across mode registry, model defaults, skill policy, remote mapping, and localized frontend mode pickers - fix chat input mode filtering and persisted agent-type validation so Multitask can be selected in the UI - move agent system reminders ahead of user_query when wrapping turn input - correct background subagent result delivery semantics so result turns display the actual returned result instead of the original delegated task
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This PR expands the agentic workflow with a new
Multitaskmode and aGeneralPurposesubagent, while improving background subagent task delivery and session behavior consistency.Key updates:
Multitaskmode and expose it across registry, defaults, remote mapping, and localized frontend mode selectors.GeneralPurposesubagent support.run_in_backgroundhandling and improved coordinator/scheduler/execution flow.bitfun-coretests to keep test runs isolated.Impact