refactor(registry): plumb RepositorySet and executor through callers

ResolveRequest and LockFileGenerationRequest now take Arc<RepositorySet>
instead of a raw Cache. install_from_lock now accepts &mut dyn
InstallerExecutor instead of constructing FilesystemExecutor internally.
Both changes expose the DI injection points needed by the upcoming
in-process test harness, where Packagist must be replaced with an empty
RepositorySet (Composer's `'packagist' => false` test config) and
filesystem install execution must be replaced with a tracing recorder
(Composer's InstallationManagerMock).

The eager VCS scan and inline-package preload still happen inside
resolve(), so the RawRepository array is kept on ResolveRequest as
raw_repositories - migrating those through RepositorySet remains a
follow-up. RepositorySet gains with_packagist and empty constructors so
production callers and future tests have a uniform construction shape.

All 136 enabled installer fixtures + 114 mozart-registry tests + 541
mozart lib tests still green; clippy clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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