v0.2.0-rc.4

Strip ecosystem prefix from lifecycle comment text (#53)

`issue.dependencyName` is ecosystem-qualified for new-format titles
(e.g. `npm::electron`), but this internal identifier was leaking into
close and reopen comments verbatim. Now the call sites split the
qualified key into a bare `name` and `ecosystem` before passing them
to the comment builders. The templates render only the bare name;
`ecosystem` is carried on the params for future use but not displayed.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>