fix(tui): accept shift+tab to cycle as an input-ready marker (#188)

Newer claude 2.1.x renders the input bar with a `shift+tab to cycle`
footer (part of "⏵⏵ bypass permissions on (shift+tab to cycle)") instead
of the classic `? for shortcuts` hint. tuiInputReady() matched only the
old string, so on those builds every pane read as never-ready: cold boots
timed out (tui_pane_not_ready) and, with the warm pool on, every pre-boot
failed (bootFailures climbed, warm hits stayed at zero) with no error
surfaced to the operator.

Widen the matcher to accept either footer. Keep the test replica verbatim
and add a positive case for the new footer.

Co-authored-by: sumlin <3495838+sumlin@users.noreply.github.com>

lib/tui/session.mjs

@@ -182,8 +182,13 @@ function tuiCapturePane(tmux, tmuxName) {
 }
 
 // True once claude's input bar is rendered and ready for keystrokes.
+// Two known ready-state footers across claude versions: the classic `? for shortcuts`
+// hint, and the `shift+tab to cycle` hint (part of "⏵⏵ bypass permissions on (shift+tab
+// to cycle)") that newer claude 2.1.x renders in its place. Match EITHER — a matcher that
+// only knew the classic string silently reported "never ready" on those builds, timing out
+// every boot (tui_pane_not_ready) and, with the warm pool on, failing every pre-boot.
 function tuiInputReady(pane) {
-  return /\? for shortcuts/.test(pane);
+  return /\? for shortcuts|shift\+tab to cycle/.test(pane);
 }
 
 // True once the pasted prompt has POSITIVELY landed in the input box. We only trust
@@ -615,8 +620,9 @@ export async function bootTuiPane({
 //      A pooled pane is SINGLE-USE: it already carries its own fresh --session-id, it
 //      serves this one turn, and it is killed in the finally like any other pane.
 //   2. On a MISS: pre-trust the scratch cwd, boot an interactive `claude` in a fresh tmux
-//      session in the scratch cwd, poll capture-pane until the `? for shortcuts` input bar
-//      appears (bootTuiPane). BOOT_MS is the max wait, not a fixed delay.
+//      session in the scratch cwd, poll capture-pane until the input bar appears — see
+//      tuiInputReady for the ready-state footers matched (bootTuiPane). BOOT_MS is the max
+//      wait, not a fixed delay.
 //   3. Write prompt to a 0600 temp file (no shell injection from prompt content).
 //   4. Paste the prompt via tmux load-buffer + paste-buffer -p (bracketed paste) —
 //      reliable for large multi-line prompts where send-keys -l is not (issue #130).

test-features.mjs

@@ -3504,7 +3504,7 @@ if (process.env.OCP_TUI_LIVE === "1") {
 // Replicates tuiInputReady, tuiPromptLanded verbatim from lib/tui/session.mjs.
 // Keep in sync with the definitions there.
 function _tuiInputReady(pane) {
-  return /\? for shortcuts/.test(pane);
+  return /\? for shortcuts|shift\+tab to cycle/.test(pane);
 }
 function _tuiPromptLanded(pane, prompt) {
   const flatPane = pane.replace(/\s+/g, " ");
@@ -3522,7 +3522,12 @@ const TUI_READY_PANE = `❯ Try "how does <filepath> work?"
 const TUI_LANDED_PANE = `❯ Reply with exactly: PONG_TEST
   ? for shortcuts · ← for agents`;
 
-// Welcome splash shown before input bar is rendered — no `? for shortcuts`.
+// Newer claude 2.1.x renders the input bar with a `shift+tab to cycle` footer instead of
+// `? for shortcuts` — the matcher must accept it too, or the pane reads as never-ready.
+const TUI_READY_PANE_SHIFT_TAB = `❯ Try "how does <filepath> work?"
+  ⏵⏵ bypass permissions on (shift+tab to cycle)`;
+
+// Welcome splash shown before input bar is rendered — neither ready-state footer.
 const TUI_BOOT_PANE = `╭─ Claude Code v2.1.114 ─ Welcome back Tao! ─╮\n│ Tips for getting started │`;
 
 console.log("\nTUI readiness + paste-verify predicates (issue #130):");
@@ -3533,6 +3538,9 @@ test("tuiInputReady(READY_PANE) === true  (input bar rendered)", () => {
 test("tuiInputReady(LANDED_PANE) === true  (input bar still present after paste)", () => {
   assert.equal(_tuiInputReady(TUI_LANDED_PANE), true);
 });
+test("tuiInputReady(READY_PANE_SHIFT_TAB) === true  (newer claude `shift+tab to cycle` footer)", () => {
+  assert.equal(_tuiInputReady(TUI_READY_PANE_SHIFT_TAB), true);
+});
 test("tuiInputReady(BOOT_PANE) === false  (welcome splash, no input bar yet)", () => {
   assert.equal(_tuiInputReady(TUI_BOOT_PANE), false);
 });