Update CLAUDE.md, AGENTS.md, plugin CLAUDE.md, and versioning docs
to make clear that contributors should not hand-bump plugin versions
or cut changelog entries in normal PRs. The automated release process
decides the next version after choosing which merged changes ship
together.
Reports and decisions are implementation artifacts that don't need to
persist in the repository. Plans in docs/plans/ are retained as living
documents that track implementation progress.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>