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Closes #5943 Closes #5942 ## User impact MCP-managed font assets now keep their identity, metadata, and generated CSS behavior predictable across upload, editing, synchronization, and rendering. ## Changes - Preserve explicit font metadata overrides while validating supported fields and rejecting unsupported metadata instead of silently dropping it. - Expose font metadata through `update-asset`, with partial updates merged into the existing metadata and validated before the mutation is committed. - Prefer the typographic family name when reading font files, so Fontsource and Google font files resolve to the same logical family where the file provides that information. - Deduplicate generated font sources by URL and format, choose a deterministic source when legacy assets collide, and derive the CSS format hint from the filename when historical metadata is stale. - Add MCP and CLI examples explaining font metadata upload and correction. - Add regression coverage for metadata persistence, invalid overrides, family-name extraction, duplicate source handling, stale format metadata, and generated runtime contracts. ## Verification - `pnpm checks` - 46 workspace packages tested, including 2,355 Builder tests, 809 CLI tests, 2,019 project-build tests, and 97 asset-uploader tests. - All workspace typechecks, Oxlint, package-boundary checks, generated API/docs checks, and fixture link/sync/build checks passed.