update_debian_changelog and update_spec_changelog wrapped the whole release message in a single prefixed line, so only the first line of a multi-line (already-bulleted) message was indented/dashed while the rest stayed at column 0. That made dpkg-parsechangelog emit 'badly formatted heading line' and rpmspec report 'bad date', failing the package build. Each non-empty body line is now indented (Debian) or dash-prefixed (RPM) individually.
update_changelog no longer auto-prepends a '* ' bullet to the CHANGELOG.md entry: the message is inserted verbatim with blank-line separation, so a caller-provided markdown list stays markdown-lint-clean instead of gaining a stray leading bullet.
Adds regression tests for the multi-line debian/rpm mirroring and the no-injected-bullet behaviour.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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