Merge pull request #648: fix(antigravity): show the working indicator while an agy turn runs

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/config/cli-registry/stock.ts

@@ -996,6 +996,30 @@ const ANTIGRAVITY: CliEntry = {
     ...AGENTS_DIR_SKILL,
     altScreen: 'strip-mux-only',
     echo: { policy: 'buffer', anchor: { kind: 'cursor' } },
+    // Measured on a live `agy` 1.3.3 pane (capture-pane every second through a prose turn
+    // and a shell-call turn, plus the raw PTY stream, 2026-10-11). A running turn animates
+    // `⣯  Generating...` (the label also reads `Working...` and `Loading...`) one row above
+    // the composer, and the footer's left end reads `esc to cancel`; at rest the footer
+    // reads `? for shortcuts` and nothing else on screen matches. A shell call replaces the
+    // composer with a `Run this command?` list, the spinner stops, and the pane goes
+    // silent. Nothing arms the idle check while the list is up (the footer hint is drawn only
+    // at rest), so a pending approval reads as working until it is answered. That differs from
+    // gemini, whose `▀` bar comes back on every spinner repaint.
+    // ⚠️ The frames are the 8-dot braille set (`⣯ ⡿ ⣻ ⣾ ⣷ ⣟ ⢿ ⣽`), none of which is in
+    // SPINNER_PATTERN's Claude set, and this entry used to declare nothing, so no frame
+    // ever marked an antigravity tab working and it never showed the activity spinner.
+    // The composer's `>` is no arming mark: the submitted prompt is echoed as `> <text>`
+    // too. The footer hint is drawn only at rest, and the turn's last repaint carries it.
+    // The schema caps a glyph at 8 characters, so this is the head of `? for shortcuts`. It also
+    // keeps the submit verifier inert (no row starts with it and holds prompt text).
+    // The working line is anchored to the start of a row, like gemini's braille branch: the
+    // idle probe tests it against the whole pane, and an answer that QUOTES the spinner row
+    // (an agent explaining this entry) would otherwise hold the tab busy while it is on screen.
+    // Every `agy` capture draws the spinner at column 0.
+    workDetect: {
+      promptGlyph: '? for sh',
+      workingLine: String.raw`(?:^|\n)[⠀-⣿]  [A-Z][A-Za-z ]{2,30}(?:\.\.\.|…)`,
+    },
     // Like codex: an ABSENT config already defaults safe (no bypass flag), so only a
     // SENT config needs the flag forced off — nothing is materialized.
     privilegedParams: [{ param: 'dangerouslySkipPermissions', clampTo: false }],

src/session.ts

@@ -4800,7 +4800,7 @@ export class Session extends EventEmitter {
           : this._mux.capturePaneText?.(this._muxSession.muxName),
       sendEnter: () => this._mux?.sendInput(this.id, '\r'),
       // ⚠ NO fallback glyph here, unlike the screen-reading probe elsewhere in this file.
-      // Only claude, codex, pi, opencode, omp and gemini declare a promptGlyph; the other modes would fall back
+      // Only claude, codex, pi, opencode, omp, gemini and antigravity declare a promptGlyph; the other modes would fall back
       // to claude's `❯`, which is ALSO starship's default shell prompt (and pure's, and
       // spaceship's, and p10k lean's). On a shell session the line `❯ npm run build` sits
       // on screen for as long as the command runs, promptStillInComposer() reads that as