fix(bmm): complete cleanup of epic-tech-context workflow removal (#1001)
- Remove references to deprecated epic-tech-context, story-context,
validate-epic-tech-context, validate-story-context, and story-done workflows
- Simplify epic status: backlog → in-progress → done (was backlog → contexted)
- Update create-story to handle legacy 'contexted' status for backward compat
- Clean up sprint-planning instructions and status template
- Update docs: agents-guide, brownfield-guide, faq, glossary, quick-start
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Brian <bmadcode@gmail.com>
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