Add chat.promptFilesRecommendations support for GitHub Copilot to show
workflow shortcuts as new chat starters.
- Add workflow-prompts-config.js with all BMM, BMGD, and core prompts
- Add workflow-prompt-generator.js to create .github/prompts/*.prompt.md
- Update github-copilot.js to generate prompts and configure VS Code
- Add phase-based prompt toggling to implementation-readiness workflow
- Add phase-based prompt toggling to sprint-planning workflow
When implementation-readiness passes or sprint-planning completes, the
workflows update VS Code settings to prioritize the 'keep going' cycle
(create-story → dev-story → code-review) over setup phase prompts.
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