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Oleg Isonen
05706b5425
Closes #6306 ## Outcome Content Block templates are now the public component model for MDX authoring. - Standard Markdown resolves through matching Content Block templates. - PascalCase JSX resolves to a named template first, then to a registered component. - Adding or changing a template immediately affects matching MDX, including content authored before that template existed. - Every supported standard MDX element is present in new Content Blocks by default. - Template `name` is a stable PascalCase JSX identifier. `label` remains optional display text only. - Lowercase JSX represents native HTML and SVG without exposing `ws.element` in authored syntax. - Unknown, ambiguous, and unsafe JSX stays in source, produces a source-ranged Builder diagnostic, and is omitted from published output. - Frontmatter images preserve exact `$ref` values and use the Asset description for `alt` text. - Keyboard and mouse insertion from the slash menu remove the trigger slash and preserve the selected template. ## Public MDX contract - Markdown is canonical for standard prose. - Lowercase JSX creates native elements: `<section><p>Text</p></section>`. - PascalCase JSX uses templates and registered components: `<PromotionCard />`, `<Heading tag="h1">Title</Heading>`, and `<YouTube src="https://youtu.be/KI5JHpzBK1s" />`. - Component-name collisions use stable qualified identifiers such as `Checkbox` and `RadixCheckbox`. - A self-closing template keeps its designed default subtree. An explicitly paired empty template clears it. - Static quoted values and bare booleans are supported. - Imports, exports, expressions, spreads, functions, executable JavaScript, unsafe attributes, `<$.*>`, and authored `<ws.element>` are rejected. - `ws` remains only for compiler primitives with no React component. ## Implementation - [x] Add stable, unique template names and keep them separate from labels. - [x] Parse and validate Markdown and JSX through their ASTs with precise source ranges. - [x] Share component identity between template JSX, Content MDX, Builder materialization, reload, copy, and publication. - [x] Resolve templates live after add, edit, rename, reorder, removal, undo/redo, collaboration updates, and reload. - [x] Preserve authored props, children, Asset references, template defaults, and the exact slash-menu template choice. - [x] Make one typed MDX semantic inventory drive default templates and slash-menu eligibility. - [x] Move component-dependent template assembly into the component registry. - [x] Replace production `$`, `animation`, and `radix` JSX namespaces with direct component imports. - [x] Keep only explicit compiler primitives in `ws` template JSX. - [x] Migrate repository templates, fixtures, stories, examples, MCP guidance, CLI guidance, and generated outputs. - [x] Add Builder unit and Playwright coverage for authoring, diagnostics, insertion, synchronization, reload, and publication. - [x] Review and update the authoritative Content Block and generated MCP documentation. ## Compatibility - Persisted project data continues to use namespaced component IDs and `ws:element` for generic HTML elements. No project-data migration is required. - Legacy `<ws.element ws:tag="…">`, `<ws.element ws:name="…">`, `<$.*>`, `<animation.*>`, and `<radix.*>` input remains readable during the compatibility window. - Current serializers and repository-owned sources emit only canonical Markdown, lowercase intrinsic JSX, or PascalCase identifiers. - Untouched user MDX is not rewritten automatically. Legacy syntax is canonicalized when its owning source is edited. - Deferred follow-up: remove legacy namespace readers and proxy support only after the canonical writer is deployed and existing projects are backfilled. This is intentionally outside this PR. ## Verification - [x] CI package tests, typechecks, lint, package boundaries, generated assets, migrations, and size checks pass. - [x] All six Builder E2E shards pass. - [x] Fixture checks pass on Ubuntu and Windows. - [x] Targeted local Content Engine, Template, SDK, registry, Project Build, migration, Builder, component, CLI, and Playwright tests pass. - [x] Runtime contracts, CLI docs, and MCP docs were regenerated from their owning sources. - [x] Local fixture generation completed without an unexpected fixture diff. - [x] Documentation impact reviewed and included in this PR. - [x] Review and approve the intentional List visual snapshot change. - [x] Run the complete agent evaluation suite after explicit approval. - [x] Run the network fixture link/sync pipeline against the matching PR deployment after explicit permission. ## Known visual change The generated List story now targets its actual default `ul` element instead of `ol`, so the default list styling appears in the visual snapshot. The visual change was reviewed and the approved visual check passes.