Introduce a per-skill render.py that resolves compile-time {{.var}}
placeholders from _bmad/bmm/config.yaml, bakes {project-root} to an
absolute path, and writes rendered .md files to
_bmad/render/bmad-quick-dev/. SKILL.md becomes a two-line stub: run
the renderer, then read the rendered workflow.
Runtime {var} placeholders (spec_file, story_key, target_status, etc.)
pass through untouched. Config-derived refs (main_config,
implementation_artifacts, communication_language, sprint_status,
deferred_work_file, planning_artifacts) are converted across
workflow.md and every step file.
Adds render/ to validate-file-refs.js INSTALL_ONLY_PATHS so the
validator recognizes the runtime-generated buffer.
bf30b69757