Two git/fossil divergence classes discovered during the tracked-set
verification: nested .gitignore files (e.g. in the project-layout templates)
are honoured by git as nested ignores of the outer repo but invisible to
fossil, leaving template content untracked in git yet managed by fossil;
and git ignore matching is case-insensitive on Windows (core.ignorecase)
while fossil globs are case-sensitive (a todo.txt pattern hits vendored
TODO.txt in git only). Both recorded in the coexistence contract with the
prescribed treatment.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
git tracked fossil's generated checkout artifacts (manifest, manifest.tags,
manifest.uuid - regenerated on every fossil checkin/checkout per the
versioned 'manifest' setting value 'rut'), which would churn as soon as
fossil commits begin. They are now untracked and git-ignored with
root-anchored patterns (nested manifest-named files elsewhere are real
content and stay tracked). Fossil control files (.fslckout/_FOSSIL_/
*.fossil) were already correctly git-ignored, and .fossil-settings/
.fossil-custom correctly git-tracked.
New .fossil-settings/AGENTS.md is the canonical home of the git+fossil
contract: which files each system must not track, the ignore-glob
derivation rules (no negation -> wholesale-ignore + explicit fossil add of
tracked exceptions; directory pruning; * crossing /; */ variants for
match-anywhere patterns; default dotfile skipping), and the verification
procedure any future "sync the ignores" request must follow (fossil extras
against git check-ignore, and a tracked-set comparison bounded to the
documented exceptions). The ignore-glob header now points there instead of
duplicating the rules; root AGENTS.md Child DOX Index gains the entry.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Julian Noble