docs: update all docs to reflect v1 live state
- template_auto_generated.wikitext: generated_at → commit parameter
- SCHEMA.md: same banner fix; clarify that frontmatter-less files are
silently skipped, not errors
- pipelines/songs/README.md: full rewrite — v1 live status, self-
contained workflow pattern, correct env table, modes, one-off setup
marked done, full decisions log
- README.md: architecture reflects actual pattern (no workflow_call),
URL_TO_GITEA variable added, setup checklist marked complete, host
network mode documented
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mikkeli
afc6a62791