Removes the last marketplace network connections from the installer.
The v6.7.0 first pass retired the official-registry fetch but left
CommunityModuleManager + RegistryClient in place, which still
fetched community-index.yaml and categories.yaml on every install
to support the channel-gate and update flows.
This commit:
- Deletes tools/installer/modules/community-manager.js and
registry-client.js entirely.
- Strips CommunityModuleManager calls from ui.js (channel gate +
update channels), core/manifest.js (getModuleVersionInfo),
core/installer.js (resolution + installed-modules listing), and
modules/official-modules.js (findModuleSource fallback +
pre-install plugin resolution + post-install manifest entry).
- Simplifies installFromResolution: community branch removed; all
non-external installs are now treated as custom-source.
- Removes corresponding test suites (CommunityModuleManager unit
tests and the entire RegistryClient suite).
- Updates CHANGELOG with the migration note.
After this commit, grep confirms zero references to the bmad-plugins-
marketplace registry from the installer. The only remaining 'marketplace'
references are about per-repo .claude-plugin/marketplace.json files,
which the installer reads from cloned custom-source repos.
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