## Summary
- New reference card (`docs/reference/infrastructure/gandi.md`) covering DNS records, Pulumi config, TLS integration
- New how-to guide (`docs/how-to/gandi-operations.md`) for DNS deployment and PAT cycling with `pbpaste` shortcut
- Rewritten homepage intro for wider audience ahead of public docs.eblu.me
- Cross-linked from reference index, routing, caddy, and how-to index
- Fixed PAT expiration inaccuracy in `pulumi/gandi/README.md` (max is 90 days, not 30)
## Test plan
- [ ] Verify wiki-links resolve in Quartz build
- [ ] Review gandi reference card for accuracy
- [ ] Review gandi-operations how-to for accuracy
- [ ] Check homepage reads well for external visitors
Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/115