Implement timer gate evaluation for Witness patrol integration: - Add `bd gate check` command to evaluate gate conditions - Support `--type=timer` filter to check only timer gates - Check if `now > created_at + timeout` for timer gates - Add `--escalate` flag to trigger `gt escalate` for expired gates - JSON output support with `--json` flag The command integrates with Witness patrol via: bd gate check --type=timer --escalate 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>