fix(antigravity): show the working indicator while an agy turn runs

agy animates an 8-dot braille spinner (⣯ ⡿ ⣻ ⣾ ⣷ ⣟ ⢿ ⣽) with a label one row above
the composer, none of which is in SPINNER_PATTERN, and the entry declared no
workDetect, so no frame ever marked a tab working.

Declare the working line from the live pane and the footer hint `? for shortcuts`
as the idle-arming mark. The composer's `>` cannot be the glyph: the echoed
prompt starts with it too. Tests use verbatim captures from agy 1.3.3.

docs/wiki/Agent-CLIs.md

@@ -69,7 +69,7 @@ output. The other CLIs expose no equivalent.
 | Respawn cycling and unattended runs               | Yes    | Yes                                                  |
 | Cron jobs                                         | Yes    | Yes                                                  |
 | Docker cases, remote SSH cases                    | Yes    | Yes                                                  |
-| Precise idle detection                            | Yes    | Codex, Pi, OpenCode, OMP and Gemini: same screen check, via their own prompt and working line. DeepSeek: reports its end of turn itself. Antigravity and Grok: generic cues only, unreliable |
+| Precise idle detection                            | Yes    | Codex, Pi, OpenCode, OMP, Gemini and Antigravity: same screen check, via their own prompt and working line. DeepSeek: reports its end of turn itself. Grok: generic cues only, unreliable |
 | Auto-resume when a usage limit resets             | Yes    | No                                                   |
 | Plan usage chip                                   | Yes    | No                                                   |
 | Approvals Inbox                                   | Yes    | DeepSeek and Codex as alerts (answer in the terminal); others no |
@@ -184,6 +184,16 @@ Google's successor to the consumer Gemini CLI, invoked as `agy`. It keeps all of
 in `~/.gemini/antigravity-cli/`, so the credential handling that applies to Gemini applies
 to it as well.
 
+- **Work detection reads its spinner row.** While a turn runs, `agy` animates an 8-dot braille
+  frame and a label one row above the composer (`⣯  Generating...`; `Working...` and
+  `Loading...` too), and its footer reads `esc to cancel`. Codeman matches that row, which is
+  what puts the activity indicator on the tab. The frames are not the braille set Claude and
+  Gemini use, which is why the tab used to look idle through a whole turn.
+- **At rest the footer hint is the idle mark.** The composer's `>` is no good for that, since
+  the submitted prompt is echoed as `> <text>` as well. `? for shortcuts` is drawn only at
+  rest, and the turn's last repaint carries it. A shell call that waits for approval replaces
+  the composer, so the tab reads as idle (waiting on you) until you answer.
+
 ### Pi
 
 Pi needs the opposite instincts from every other CLI here.