docs(v1): update exports, Storybook taxonomy, and migration notes

[egdev6]

Goal

Update public exports, Storybook structure, and documentation after the V1 component recatalogation.

Work

• Update src/index.ts exports to match the V1 taxonomy.
• Decide whether old paths need temporary aliases.
• Document any breaking import-path changes.
• Reorganize Storybook titles by primitives, atoms, molecules, and organisms.
• Link the cataloging criteria docs from contributor documentation.
• Ensure package consumption examples use the new public exports.

Acceptance criteria

• Consumers can import every public component from the documented path.
• Storybook groups reflect the V1 taxonomy.
• Migration notes exist for changed paths.
• No duplicate public exports remain unless explicitly marked as temporary aliases.
• Build and package consumption verification pass.