test(interactive): replace blind y-loops with accept_until helper

Add an accept_until helper that only sends "y" when a new [Y/n] prompt
appears in the tmux pane, replacing the fixed-count blind send loops that
could race ahead of prompts or send stray input. Resilient to changes in
the number of apply-phase prompts.

Relates to #51

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/interactive/helpers.sh

@@ -100,6 +100,33 @@ assert_contains() {
     return 1
 }
 
+# Accept all [Y/n] prompts until a stop pattern appears in the pane.
+# Usage: accept_until "Signing key options" [max_iterations]
+accept_until() {
+    local stop_pattern="$1"
+    local max_iters="${2:-80}"
+    local pane_content last_content=""
+    local i
+    for ((i = 0; i < max_iters; i++)); do
+        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
+        if printf '%s' "$pane_content" | grep -qF "$stop_pattern"; then
+            return 0
+        fi
+        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
+            return 0
+        fi
+        # Only send "y" when a new prompt has appeared (pane changed and shows [Y/n])
+        if [ "$pane_content" != "$last_content" ] \
+            && printf '%s' "$pane_content" | grep -qE '\[Y/n\]|\[y/N\]'; then
+            send "y" Enter
+            last_content="$pane_content"
+            sleep 0.3
+        else
+            sleep 0.2
+        fi
+    done
+}
+
 pass() {
     printf '%b  PASS:%b %s\n' "$C_GREEN" "$C_RESET" "$1" >&2
 }

test/interactive/test-full-accept.sh

@@ -26,21 +26,8 @@ main() {
     wait_for "Proceed with hardening"
     send "y" Enter
 
-    # Accept each setting prompt by sending "y" + Enter repeatedly.
-    # v0.2.0 adds more prompts (pre-commit hook, gitignore, core.symlinks),
-    # so we need enough iterations to get through all of them.
-    local pane_content
-    for _ in $(seq 1 50); do
-        sleep 0.3
-        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
-        if printf '%s' "$pane_content" | grep -qF "Signing key options"; then
-            break
-        fi
-        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
-            break
-        fi
-        send "y" Enter
-    done
+    # Accept all [Y/n] prompts until signing wizard
+    accept_until "Signing key options"
 
     # Signing wizard — skip
     wait_for "Signing key options" 20

test/interactive/test-identity-guard.sh

@@ -36,20 +36,8 @@ main() {
     wait_for "Proceed with hardening"
     send "y" Enter
 
-    # Accept settings until identity guard prompt appears
-    local pane_content
-    for _ in $(seq 1 50); do
-        sleep 0.3
-        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
-        if printf '%s' "$pane_content" | grep -qF "Enter your name"; then
-            break
-        fi
-        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
-            fail "Identity guard did not trigger — reached completion"
-            exit 1
-        fi
-        send "y" Enter
-    done
+    # Accept all [Y/n] prompts until identity guard
+    accept_until "Enter your name"
 
     # Identity guard: enter name
     wait_for "Enter your name" 15
@@ -59,18 +47,8 @@ main() {
     wait_for "Enter your email" 10
     send "test@example.com" Enter
 
-    # Continue accepting remaining prompts
-    for _ in $(seq 1 50); do
-        sleep 0.3
-        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
-        if printf '%s' "$pane_content" | grep -qF "Signing key options"; then
-            break
-        fi
-        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
-            break
-        fi
-        send "y" Enter
-    done
+    # Accept remaining [Y/n] prompts until signing wizard
+    accept_until "Signing key options"
 
     # Skip signing
     if tmux capture-pane -t "$TMUX_SESSION" -p | grep -qF "Signing key options"; then

test/interactive/test-signing-generate.sh

@@ -34,19 +34,8 @@ main() {
     wait_for "Proceed with hardening"
     send "y" Enter
 
-    # Accept settings until signing wizard (v0.2.0 adds more prompts)
-    local pane_content
-    for _ in $(seq 1 50); do
-        sleep 0.3
-        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
-        if printf '%s' "$pane_content" | grep -qF "Signing key options"; then
-            break
-        fi
-        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
-            break
-        fi
-        send "y" Enter
-    done
+    # Accept all [Y/n] prompts until signing wizard
+    accept_until "Signing key options"
 
     # Signing wizard — option 1: generate ed25519
     wait_for "Signing key options" 20

test/interactive/test-signing-skip.sh

@@ -35,19 +35,8 @@ main() {
     wait_for "Proceed with hardening"
     send "y" Enter
 
-    # Accept settings until signing wizard (v0.2.0 adds more prompts)
-    local pane_content
-    for _ in $(seq 1 50); do
-        sleep 0.3
-        pane_content="$(tmux capture-pane -t "$TMUX_SESSION" -p 2>/dev/null || true)"
-        if printf '%s' "$pane_content" | grep -qF "Signing key options"; then
-            break
-        fi
-        if printf '%s' "$pane_content" | grep -qF "Hardening complete"; then
-            break
-        fi
-        send "y" Enter
-    done
+    # Accept all [Y/n] prompts until signing wizard
+    accept_until "Signing key options"
 
     # Signing wizard — skip
     wait_for "Signing key options" 20