v0.3.51

Changes

• Add optimize command to decide when group catalog routing beats exposing every native skill metadata entry.
• Include optimize in self-test so deployments verify the decision gate.
• Update Codex/PowerShell wrappers and docs for group catalog optimization.

Verification

• python -m pytest -q
• agent-skill-groups self-test --json
• python -m build
• local wheel install + self-test in a fresh venv