fix(scripts): run-ios-simulator.sh exits silently when no Booted sim found

When no simulator is booted, grep -oE finds no UUID and exits 1. With
set -euo pipefail, that non-zero exit propagates through the command
substitution and kills the script at the UDID= assignment before it can
fall through to the boot-one branch.

Fix: add || true to both find_sim and sim_name pipelines so they always
return 0 regardless of whether a match was found.

Also replace sleep 2 with xcrun simctl bootstatus <UDID> -b, which blocks
until the simulator is fully booted — more reliable than a fixed delay
and faster when the simulator starts quickly.

Update docs/building.md §9 to show the bootstatus command.

scripts/run-ios-simulator.sh

@@ -67,21 +67,23 @@ vc_log "app: $APP"
 find_sim() {
     # Each line from simctl looks like:
     #   "    iPhone 16 (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX) (Shutdown)"
+    # The || true at the end prevents set -e from killing the script when no
+    # matching device exists (grep -oE exits 1 on no match).
     local filter="${1:-}" state="${2:-}"
     local pattern="iPhone"
     [[ -n "$filter" ]] && pattern="$filter"
     xcrun simctl list devices available 2>/dev/null \
-        | grep -E "[[:space:]]$pattern" \
+        | grep -E "$pattern" \
         | { [[ -n "$state" ]] && grep "$state" || cat; } \
         | head -1 \
         | grep -oE '[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}' \
-        | head -1
+        | head -1 || true
 }
 
 sim_name() {
     xcrun simctl list devices available 2>/dev/null \
         | grep "$1" | head -1 \
-        | sed 's/[[:space:]]*('"$1"').*//' | sed 's/^[[:space:]]*//'
+        | sed 's/[[:space:]]*('"$1"').*//' | sed 's/^[[:space:]]*//' || true
 }
 
 if [[ -n "$DEVICE_UDID" ]]; then
@@ -100,16 +102,17 @@ else
         vc_step "booting simulator: $NAME ($UDID)"
         xcrun simctl boot "$UDID"
         open -a Simulator
-        # Give Simulator.app a moment to display the device.
-        sleep 2
+        # Wait for the simulator to finish booting before installing.
+        vc_log "waiting for simulator to boot…"
+        xcrun simctl bootstatus "$UDID" -b
     fi
 fi
 
 NAME="$(sim_name "$UDID")"
 vc_log "simulator: $NAME ($UDID)"
 
-# If the simulator exists but Simulator.app isn't open, open it.
-open -a Simulator &>/dev/null || true
+# Bring Simulator.app to the foreground (no-op if already open).
+open -a Simulator
 
 # ── Install ───────────────────────────────────────────────────────────────────
 vc_step "installing VoiceCatiOS"