feat(journal-template): commit permanent journal/AGENTS.md + skill-link symlinks
Commit the journal-side agent stub and permanent skill symlinks so journal
checkouts can resolve the shared journal skill without relying on a maint task.
Update ignore rules to keep the template files tracked while leaving runtime
journal data ignored.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>