Issue #195: in coordinator mode, the React TUI and Textual app never
injected `<task-notification>` envelopes after a worker finished.
`run_print_mode` had `_drain_coordinator_async_agents` wired in, but
`ReactBackendHost._process_line` and `TextualApp._process_line` only
called `handle_line` and returned, leaving the contract documented in
the coordinator system prompt (results arrive between turns) unmet.
Extract the drain helpers into `openharness.ui.coordinator_drain` and
invoke `drain_coordinator_async_agents` from both interactive hosts
after `handle_line` when coordinator mode is active. The shared module
also avoids a circular import between `ui.app` and `ui.backend_host`.
A lightweight open-source Python implementation of the Agent Harness architecture.
44x lighter than Claude Code (11K vs 512K lines), 98% core tool coverage.
- 43 tools with Pydantic validation and parallel execution
- Skills system compatible with anthropics/skills (17+ tested)
- Plugin system compatible with claude-code/plugins (12+ tested)
- API retry with exponential backoff
- Multi-level permissions with path rules
- React/Ink TUI with "Oh my Harness!" branding
- 114 unit tests + 6 E2E test suites
- MIT License
tjb-tech