feat(skills): add TOML workflow customization to 17 bmm-skills
Flattens each skill's workflow.md into SKILL.md and adds a customize.toml
surface with a 6-step activation block (resolve_customization, prepend,
persistent_facts, config, greet, append). Core-skills and developer
execution skills (dev-story, code-review, sprint-planning, sprint-status,
quick-dev, checkpoint-preview) are intentionally excluded.
Customized: document-project, prfaq, domain/market/technical-research,
create-prd, create-ux-design, edit-prd, validate-prd,
check-implementation-readiness, create-architecture,
create-epics-and-stories, generate-project-context, correct-course,
create-story, qa-generate-e2e-tests, retrospective.
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