feat: TUI remote connection to daemon via A2A protocol#679
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Add --daemon flag (daemon+a2a features) that bootstraps a full agent with LoopbackChannel, exposes an A2A JSON-RPC server under DaemonSupervisor, writes a PID file, and shuts down cleanly on SIGINT. Add --connect <URL> flag (tui+a2a features) that connects the TUI to a running daemon via A2A SSE, mapping TaskEvent to AgentEvent in real time. Final ArtifactChunk text is no longer discarded before Flush. Add LoopbackChannel / LoopbackHandle / LoopbackEvent to zeph-core as a headless channel for programmatic agent I/O. PID file creation uses O_CREAT|O_EXCL to prevent TOCTOU races. Refactor TaskProcessor::process to accept an mpsc::Sender<ProcessorEvent> and stream events instead of returning a synchronous ProcessResult. Server-side event type renamed to ProcessorEvent to avoid collision with the client-side TaskEvent. Expand command palette: new TuiCommand variants (Quit, Help, NewSession, ToggleTheme, DaemonConnect, DaemonDisconnect, DaemonStatus), shortcut hints, and fuzzy-match scoring with gap penalty replacing substring filter. Fixes app:theme incorrectly mapping to Help. Closes #582, #583, #584, #585, #678
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Add daemon mode guide, update CLI reference with --daemon/--connect flags, expand command palette docs to 14 commands, add LoopbackChannel and streaming TaskProcessor to architecture pages, update channels reference with Loopback channel, and update feature flag descriptions.
Remove unused OllamaProvider import (src/main.rs:1544), fix unused mut on LoopbackChannel test handle, add missing struct fields (metadata, task_id, context_id) in multi-chunk test, use add_artifact instead of append_history for accumulated response text.
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Summary
LoopbackChannelfor headless agent communication bridging A2ATaskProcessorwith agent loop via tokio mpsc (feat(core): add LoopbackChannel for headless agent communication #582)TaskProcessortrait to streaming model withProcessorEventandevent_txchannel (feat(a2a): streaming TaskProcessor routed through full agent loop #583)--daemonmode with fullAppBuilderbootstrap,DaemonSupervisor, PID lifecycle, graceful shutdown (feat(daemon): wire --daemon mode with DaemonSupervisor #584)--connect <url>TUI remote mode mapping SSETaskEventtoAgentEventin real-time (feat(tui): --connect mode to attach TUI to remote daemon via A2A SSE #585)ToggleThemevariant (feat(tui): expand command palette with daemon controls and fuzzy matching #678)--initwizard with daemon configuration step (host, port, auth token)OpenOptions::create_new(true)Closes #582, closes #583, closes #584, closes #585, closes #678
Test plan
cargo nextest run --workspace --lib --bins)cargo clippy --workspace -- -D warningscleancargo clippy --features tui,a2a -- -D warningscleancargo check --features daemon,a2acompilescargo +nightly fmt --checkcleancargo run --features daemon,a2a -- --daemonstarts A2A servercargo run --features tui,a2a -- --connect http://localhost:3000connects TUI