passdown v0.3.0

Added

• Standalone markdown planning template with Passdown dispatch tags, done
  criteria, and verification fields.
• Optional --skills-only direct-install mode for users who do not use
  OpenSpec.
• Integration guidance for standalone Passdown, OpenSpec, Superpowers, and the
  combined workflow.

Changed

• Made passdown-dispatch an explicit pre-execution gate for multi-task plans,
  including plans about to enter Superpowers executing-plans.
• Added a consumer workspace invariant requiring routing before implementation.
• Defined planning: markdown with a plan_dir key in passdown-intake, so
  standalone plans are created from the markdown template without OpenSpec.
• Documented the dispatch gate, optional integrations, standalone markdown
  planning, and --skills-only in the README and smoke-test checklist.

Fixed

• Prevent plan executors from bypassing Passdown routing merely because another
  plugin entered its own execution skill first.
• Reject combining --into with --host or --skills-only in any argument
  order instead of silently installing the schema and dropping the other flags.