feat: carry the catalog forward into the cairn estate First release under dunn.dev/cairn/pipeline. Carried forward from dunn.dev/immutable/pipeline at v8.4.0 with full git history and every release tag intact — the tags below v9 document the design arc that produced this catalog. No component was redesigned; this is a home move plus an identity repoint. The major bump reflects the one breaking change: component include paths move namespace. Consumers pinning `dunn.dev/immutable/pipeline/<component>@<tag>` must repoint to `dunn.dev/cairn/pipeline/<component>@<tag>`. - Registry image references, component include examples, pipeline and release badges, the kickstart/summary clone-URL literals, CI comments, and container LABELs repointed to the cairn namespace. - Estate-identity prose (README, CONTRIBUTING, the builder-image header) and the brand SVGs now name the cairn estate. - README records the carry-forward lineage from immutable/pipeline. - All dated CHANGELOG entries and annotated-tag release notes below v9. - Cross-estate references to the still-live immutable basef/instance projects and the immutable.dunn.dev estate site. - The just-recipe (catalog CI) / inline-YAML (component templates) / POSIX-sh (release scripts) boundaries.