Break the monolithic forge-interaction skill into focused, single-responsibility
skills for better predictability and maintainability:
- Add forge-github skill for GitHub-specific interactions using `gh` CLI
- Add forge-gitea skill for Gitea-specific interactions using `tea` CLI
- Convert forge-interaction into a router that delegates to specialized skills
- Add forge-router skill with model invocation disabled for guidance only
- Move all forge-related skills to common/deprecated directory
Each specialized skill now contains its own complete decision tree, CLI usage
patterns, and authentication checks for its respective forge platform.
gitadmin
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