[ncooke3]

Follow-up to #1882 to harden simulator provisioning when multiple point-release runtimes or unavailable duplicate devices exist on shared macOS runners.

This PR updates scripts/setup_simulator.sh, .github/actions/setup_simulator/action.yml, and scripts/test.sh to:

• Prefer exact major.minor SDK runtime matching (e.g., iOS 26.4 for Xcode 26.4 on macos-26 where 26.2, 26.4, and 26.5 runtimes are installed side-by-side) before falling back to major-version matching.
• Delete any existing unavailable simulators with the same name prior to creation to prevent duplicate-destination ambiguity.
• Use literal grep -Fq device matching, tolerate leading whitespace in simctl list runtimes, explicitly invoke setup_simulator.sh via bash, and only auto-run setup_simulator.sh from scripts/test.sh when DEVICE uses a Firebase- prefix.

[gemini-code-assist]

Code Review

This pull request improves simulator setup and testing scripts by explicitly invoking them with bash, refining runtime detection to match major and minor versions, and cleaning up existing unavailable simulators before creation. Feedback on these changes suggests optimizing version extraction using Bash's built-in regex matching instead of subshells, correcting backslash escaping in parameter expansion for runtime filtering, and making the UUID regex case-insensitive to robustly handle lowercase characters.

[gemini-code-assist]

In Bash parameter expansion replacement strings, a single backslash escapes the following character (e.g., \\. becomes .). To produce a literal backslash in the expanded string (so that grep receives \\. to match a literal dot), you must double the backslash: ${target_major_minor//./\\\\.}.

Suggested change

	runtime=$(xcrun simctl list runtimes available | grep -E "^[[:space:]]*${platform_prefix} ${target_major_minor//./\.}([^0-9]|$)" | grep -o "com\.apple\.CoreSimulator\.SimRuntime\.${platform_prefix}-[0-9-]*" | tail -n 1 || true)
	runtime=$(xcrun simctl list runtimes available | grep -E "^[[:space:]]*${platform_prefix} ${target_major_minor//./\\.}([^0-9]|$)" | grep -o "com\.apple\.CoreSimulator\.SimRuntime\.${platform_prefix}-[0-9-]*" | tail -n 1 || true)

[gemini-code-assist]

Spawning subshells with echo and grep is inefficient and unnecessary in Bash. We can use Bash's built-in regular expression matching ([[ ... =~ ... ]]) to extract the major and minor version numbers directly and more efficiently.

Suggested change

	target_major_minor=$(echo "$sdk_ver" | grep -oE '^[0-9]+\.[0-9]+' || true)
	[[ "$sdk_ver" =~ ^[0-9]+\.[0-9]+ ]] && target_major_minor="${BASH_REMATCH[0]}"

[gemini-code-assist]

UUIDs in simctl output can sometimes contain lowercase letters depending on the environment or how they were generated. Using [0-9a-fA-F] is more robust and prevents potential matching failures.

Suggested change

	xcrun simctl list devices | grep -F "${sim_name} (" | grep -oE '[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}' | while read -r uuid; do
	xcrun simctl list devices | grep -F "${sim_name} (" | grep -oE '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}' | while read -r uuid; do