AgentCliBusyPhase extension
The busy-row phase push (issue #653): a plain passthrough. The busy
row names the CURRENT activity — Compacting context… while the fold
runs, then the post-fold handback ('') clears the marker the moment
the compaction finishes, and later tool/stream labels stay marker-free.
The «auto-compacted · continuing» badge used to be appended to every
label here, so after any fold the row led with the stale marker for
the rest of the run (owner screenshot: [auto-compacted ×7 · c… over
active tool work). The badge lives on the status row only
(_statusLine, until the turn settles — issue #438 AC3).
- on