v6.12.1

Every skill now reads the same merged config, so overrides in _bmad/custom/config.toml and config.user.toml apply everywhere (#3019).

🐛 Fixes

• 23 bmm skills, including the v6 shims, load config through resolve_config.py instead of reading _bmad/bmm/config.yaml directly (#3019).
• config.toml now carries the defaults for user-scope keys, so bmad-build and bmad-build-auto render on a fresh clone without config.user.toml. Re-run the installer to pick this up (#3016).
• bmad-create-epics-and-stories writes status: draft and keeps it when final validation fails, listing the open checks. status: final is set only when every check passes (#3020).
• Party mode's create-party collision check now sees aliases and custom-only member codes, via resolve_party.py --list-codes (#3015).