Package BMad Automator without installer runtime patches

[dickymoore]

Warning

These are LLM-authored changes and have not been human sanity-checked yet. This PR is intentionally draft I have double-checked the implementation.

Summary

Refactors the BMAD-METHOD side of Automator/Codex support so this repo only handles installer registration and packaging. Runtime behavior now belongs in the Automator source repo instead of being patched by the installer.

Key changes:

• register BMad Automator as an experimental external module via fallback registry metadata
• support external module source-root and target metadata in the installer
• install Automator only for explicitly supported IDE targets
• package Automator runtime source from the Automator repo into the installed skill without patching it
• document the module boundary and experimental status
• add deterministic installer tests for the source-root, target filtering, and packaging behavior

Why

The earlier approach changed BMAD-METHOD installer code to mutate an external module's runtime implementation. That blurred ownership between BMAD-METHOD and bmad-automator. This PR narrows BMAD-METHOD back to installer/package integration and leaves runtime support to Automator.

Companion PR

• Runtime/source change: feat: add Codex runtime support bmad-automator#3

Tests

The repo pre-commit pipeline ran during commit and passed, including:

• npm run test:refs
• npm run test:install
  • 403 installation component tests passed
• npm run test:urls
• npm run test:channels
  • 83 channel resolution tests passed
• npm run lint
• npm run lint:md
• npm run format:check
• docs link validation and docs build

Notes

This intentionally avoids adding more Automator runtime behavior to BMAD-METHOD. If the companion Automator PR changes shape, this installer PR should follow that boundary rather than duplicating runtime logic here.

[dickymoore]

Closing this draft because it targeted upstream main directly. The replacement is stacked onto the Automator branch it was based on: bma-d#2