Adds `mosaic config` command tree with five subcommands (show, get, set,
edit, path) backed by ConfigService; adds minimal get/set/path/readAll
primitives to ConfigService + FileConfigAdapter. Includes Vitest tests.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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Adds top-level mosaic config command tree (CU-04-04, CU-04-05)