0.9.1: adopt upstream bmad-build-auto rename, harvest spec-frontmatter deferrals (#405)#406

pbean merged 56 commits into

release/0.9.xbmad-code-org/bmad-loop:release/0.9.xfrom

hotfix/0.9.1-build-autobmad-code-org/bmad-loop:hotfix/0.9.1-build-autoCopy head branch name to clipboard