Adds --remote CLI flag and fix_all_remote() function. When run without a
REPO argument, the target checks all registered repos and:
- Skips repos whose local path does not exist on this machine
- Skips repos that are already clean (no fixable issues, no FAILs, not
behind remote, only C-08 background noise allowed)
- For repos that need work: git pull --ff-only then fix_repo()
Prints a summary of CLEAN (skipped) and NOT ON THIS HOST (skipped) repos
before the detailed fix reports.
Simplifies the Makefile target from shell-level curl+git to a single
uv run call using --remote. Same flag handles both single-repo and all-repos.
Also adds _git_pull() helper and 13 new tests (71 total in consistency suite).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>