Bug fixes
- Build lock is keyed on books/ so builds started from different
directories block each other (fixes two tests broken by 89b828efa3).
- ConfigManager resolves the repo root when binder runs from books/ or
binder/, so bib, newsletter, doctor and render paths are right.
- `build <word> --all` treats intro/scaling/agentic/physical as chapter
names (it built every volume), and Ctrl-C stops a --all loop.
- doctor checked chapter names that no longer exist and failed on the
generated _quarto.yml; info defaulted to a deleted books/contents.
- `headings apply --path <typo>` no longer rewrites the whole book;
`bib clean` stops on unreadable chapters instead of dropping entries.
- Discovery falls back to a line scan on invalid YAML instead of crashing.
- Volume III/IV were labeled Volume II in layout and release output.
Output
- Unexpected errors print the command, exception type, and raising
file:line (new cli/core/errors.py), with the traceback on stderr.
- Chapter-not-found suggests the closest names and the list command.
- Silent except blocks in bib lookups, info, headings, layout,
maintenance, preview and debug now say what went wrong.
Cleanup
- Shared qmd_files_under/display_path, file-rewrite loop, doctor result
helper, preview server, clean helpers, volume display names.
- Removed legacy import fallbacks, dead config attributes, legacy backup
restore logic, and unused imports.
