1. build/metadata.yaml: removed trailing '---' that caused yaml.safe_load
to fail with 'expected a single document in the stream'.
Pandoc accepts metadata without the closing delimiter.
2. .gitea/workflows/build.yml: changed build-verify.py reference from
scripts/build-verify.py (doesn't exist) to build/build.py --md
(the actual build script).
Build system for The Testament:
- build/build.py: compiles chapters to PDF, EPUB, MD
- build/metadata.yaml: book metadata
- build/frontmatter.md: title page, dedication
- build/backmatter.md: acknowledgments, sovereignty note
- Makefile: make pdf, make epub, make md
- .gitignore: build artifacts