Harden prepare-readme validation for em_/en_ symlinks on macOS

[Copilot]

PR #51 already treats em_ and en_ as symlinks to _mnn, but the prepare-readme path still had outdated assumptions around README expectations and could fail on macOS because Actions invoked it under Bash 3.2. This update narrows the fix to the validation path: keep the README contract aligned with symlink-aware behavior and make the prepare-readme test runnable under Bash 4.3+.

• README contract checks

  • Assert that README.md documents em_ and en_
  • Assert that README.md does not document _mnn
  • Fail with explicit diagnostics when any of those assumptions drift

• macOS compatibility for prepare-readme CI

  • Add a small Bash bootstrap in scripts/test-prepare-readme.sh
  • If the script starts under Bash < 4.3, re-exec under a newer Homebrew-installed Bash when available
  • This keeps .github/scripts/validate-scripts.sh on its required shell version without changing the underlying validation logic

• Targeted negative-path coverage

  • Preserve the malformed-README failure case
  • Keep the test focused on the current symlink-aware README rules instead of _mnn-based assumptions

if ((BASH_VERSINFO[0] < 4 || (BASH_VERSINFO[0] == 4 && BASH_VERSINFO[1] < 3))); then
  for candidate in /opt/homebrew/bin/bash /usr/local/bin/bash; do
    if [[ -x "$candidate" ]]; then
      exec "$candidate" "$0" "$@"
    fi
  done
fi

if ! grep -qF -- "- [\`em_\`](em_):" README.md; then
  echo "README is missing the em_ symlink entry" >&2
  exit 1
fi

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[Copilot]

Pull request overview

Updates the prepare-readme validation test to align README expectations with the symlink-aware em_/en_ behavior (and _mnn omission), and makes the test more reliable on macOS by bootstrapping to Bash 4.3+ when the default shell is too old.

Changes:

• Add a Bash 4.3+ re-exec bootstrap to scripts/test-prepare-readme.sh for macOS/Homebrew environments.
• Add explicit README contract assertions: em_ and en_ must be documented; _mnn must not be documented.
• Adjust the test step labeling to reflect the expanded validation flow.

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