M6 — Polish

New Issue

Goal

Make long sessions durable and the TUI pleasant to actually live in.

Auto-compaction: Compactor + overflow trigger, threaded through the engine loop
Session-title generation via a configured small_model
Crash-resume hardening: an unfinished assistant message left by a killed process is
marked aborted on load instead of replayed
Theming — theme: Option<String> exists in config::schema but isn't read anywhere in
harness-tui
Syntax-highlighted code blocks in the markdown renderer
Streaming-render perf pass (incremental layout / tail-only re-render beyond the
existing markdown render cache from M2)

A session driven past the context limit compacts via Compactor and continues correctly,
with prior turns summarized rather than dropped or truncated mid-message.
After a new session's first turn, its title reflects a small_model-generated summary
instead of the default placeholder.
Resuming a session whose process was killed mid-turn shows the last assistant message as
aborted, and does not replay or re-send it to the provider.
Setting theme in config produces a visibly different TUI color scheme; switching between
at least two configured themes changes the rendered output.
Fenced code blocks in assistant messages render with syntax highlighting matching the
fence's declared language.
Streaming a long assistant response renders incrementally without visible input lag or
full-viewport re-layout on each token.

No due date

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