1. Gate findProjectRoot to commands that access .planning/ — skip for
pure-utility commands (generate-slug, current-timestamp, template,
frontmatter, verify-path-exists, verify-summary) to avoid unnecessary
filesystem traversal on every invocation.
2. Warn to stderr when commit-to-subrepo encounters files that don't
match any configured sub-repo prefix.
3. Document that loadConfig auto-syncs sub_repos with the filesystem,
so config.json may be rewritten when repos are added or removed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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