Release 0.6.3 (cljdoc-renderable)

v0.6.2 published to Clojars cleanly but cljdoc rejected the doc tree
because children in doc/cljdoc.edn were wrapped in an extra vector.
Per cljdoc's grammar, children are inline siblings of the parent,
not nested in a wrapping vector. Fixed and bumped to 0.6.3.

Release 0.6.2 (Clojars-ready)

v0.6.1 was tagged but Clojars rejected the upload because the pom
was missing the block; Clojars locks coordinates on first
upload attempt, so 0.6.1 is permanently unusable.

This release fixes the pom and bumps to 0.6.2 — first version of the
docs release that's actually installable.

• build.clj writes (MIT) into the pom
• bump 0.6.1 → 0.6.2 in build.clj, project.clj, deps.edn codox alias
• CHANGELOG: rename heading to [0.6.2] - 2026年04月27日 with note on the
  skipped 0.6.1
• README install snippets bumped; status row notes the skip