Extract shared utilities from @refrakt-md/svelte to @refrakt-md/transform

Acceptance Criteria

• serialize() and serializeTree() moved to packages/transform/src/serialize.ts
• matchRouteRule() moved to packages/transform/src/route-rules.ts
• Both are exported from @refrakt-md/transform public API (packages/transform/src/index.ts)
• @refrakt-md/svelte re-exports both modules — no breaking change for existing consumers
• @refrakt-md/transform adds @markdoc/markdoc as a dependency (needed by serialize())
• All existing tests pass without modification
• Build succeeds in dependency order (types → transform → svelte)

Approach

1. Copy packages/svelte/src/serialize.ts → packages/transform/src/serialize.ts
2. Copy packages/svelte/src/route-rules.ts → packages/transform/src/route-rules.ts
3. Update imports in both files if needed (type imports should already point at @refrakt-md/types)
4. Export from packages/transform/src/index.ts
5. Replace original files in packages/svelte/src/ with re-exports from @refrakt-md/transform
6. Update any internal imports within packages/svelte/ that reference these modules directly

References

• Framework Adapter System (Phase 0)
• Astro Readiness Investigation, Framework Readiness Investigation: Next.js, Eleventy, Nuxt (both identify this as a shared prerequisite)

Resolution

Completed: 2026-04-02

Branch: claude/implement-spec-030-F0LFn

What was done

• Moved serialize() and serializeTree() from packages/svelte/src/serialize.ts to packages/transform/src/serialize.ts
• matchRouteRule() was already in packages/transform/src/route-rules.ts (previously extracted)
• Added @markdoc/markdoc as dependency to @refrakt-md/transform
• Exported both serialize and serializeTree from transform's public API
• Updated @refrakt-md/svelte serialize.ts to re-export from transform
• All 167 test files (1877 tests) pass, build succeeds

Notes

• Route rules extraction was already done in a prior session — only serialize needed moving