fix(installer): route community installs through PluginResolver when marketplace.json ships (#2331)

* fix(installer): route community installs through PluginResolver when marketplace.json ships

Community-catalog installs ignored .claude-plugin/marketplace.json, so modules
that nest module.yaml inside a setup skill's assets/ directory (e.g. Strategy 2
in PluginResolver) ended up half-installed: only module-help.csv and the
generated config.yaml landed in _bmad/<code>/, while the actual skill source
trees and module.yaml never got copied. The install would silently emit
"could not locate module.yaml" warnings and leave .agents/skills/ without
the module's skills.

The fix wires the existing PluginResolver onto the community path:

- CommunityModuleManager.cloneModule now detects marketplace.json after the
  clone+ref-checkout completes and runs PluginResolver. The resolution is
  stamped with channel/sha/registryApprovedTag/registryApprovedSha and cached
  in _pluginResolutions, mirroring the existing _resolutions cache.
- OfficialModules.install consults the community plugin resolution and
  delegates to installFromResolution (the same code path custom-source
  installs already use). installFromResolution branches on communitySource
  to write source: 'community' with the registry's approved tag/sha and
  channel.
- resolveInstalledModuleYaml now searches the community-modules cache root
  in addition to the external-modules cache, and the BMB setup-skill detector
  walks src/skills/ and skills/ (not just the repo root) so collectAgents
  FromModuleYaml and writeCentralConfig can find module.yaml in nested
  marketplace-plugin layouts.

Backward compatibility: repos without marketplace.json (e.g. WDS, which
declares module_definition: src/module.yaml at the root) continue through
the legacy findModuleSource path with no behavior change. Verified against
the live zarlor/suno-band-manager community module and a 23-check fixture
suite covering Suno-shape, WDS-shape, and bare-repo layouts.

* fix(installer): harden community marketplace.json resolution path

Address review feedback on the community marketplace.json install path:

- Wrap PluginResolver.resolve() in try/catch so a malformed plugin entry
  falls through to the legacy install path with a warn instead of
  crashing cloneModule.
- Stop mutating the resolver's return object; shallow-clone before
  stamping community provenance so install state cannot leak back into
  resolver-owned objects.
- Warn when _selectPluginForModule lands on the single-plugin fallback
  with a name that doesn't match the registry code or module_definition
  hint, so a misconfigured marketplace.json can't silently install the
  wrong plugin.
- Add CommunityModuleManager.resolveFromCache() and call it from
  OfficialModules.install() when the in-process plugin cache is empty,
  so callers that reach install() without pre-cloning still get the
  marketplace-aware path. Reuses an existing channel resolution when
  present, otherwise synthesizes a stable-channel stub from the registry
  entry plus the cached repo's HEAD.
- Align installFromResolution()'s returned versionInfo.version with
  manifestEntry.version precedence (communityVersion || cloneRef || ...)
  so downstream summaries match what was written to the manifest.

Tests: lint, format:check, lint:md, test:install (290), test:channels
(83), test:refs (7) all green.