Builds on the salvaged typing_status_text plumbing (PR #62007): instead
of a static 'is thinking...', Slack's assistant status line now updates
live as the agent works — 'is running pytest tests/…', 'is reading
docs/api.md…' — and reverts to the static text between tool calls.
Mechanics:
- agent/display.py: build_status_phrase() derives a <=49-char present-
tense phrase from the existing _TOOL_VERBS table (+ 'is using <name>'
for plugin/MCP tools; None for _thinking).
- base adapter: supports_status_text capability flag + set_status_text()
per-chat store, cleared when the typing loop winds down.
- Slack adapter: send_typing() renders the live phrase when set, falling
back to typing_status_text then 'is thinking...'.
- gateway/run.py: progress_callback stashes the phrase on tool.started
and clears on tool.completed. Rendering rides the existing
_keep_typing refresh cadence — zero additional Slack API calls, no
rate-limit exposure. Works with tool_progress: off (Slack default);
the callback is now armed whenever the adapter supports status text.
- display.live_status config (full|verb|off, default full): 'verb' hides
argument previews for shared/customer-facing channels.
Also fixes a latent crash in the cherry-picked from_dict: malformed
non-dict 'extra' sections broke typing_status_text resolution (uses the
already-coerced extra dict).
Design notes: status text is a side-effect display channel only — never
enters the transcript, no prompt-cache impact. Lifecycle guarantees from
the stuck-status fix family are preserved (per-thread tracking,
clear-on-finish via existing stop_typing paths). Related: #45109
(closed; same direction via lifecycle states), #59010/#51363 (native
task cards — complementary, larger scope).
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