[ejgallego]

This PR adds explicit Rosetta analysis and offline rendering for checked code blocks and named external references in Verso and Blueprint documents. The generic LSP core and Verso bridge come from the independent ejgallego/rosetta repository; Blueprint retains its semantic model. This develops the integration path explored from #63.

• Pin both standalone Rosetta packages to the reviewed revision in fix: harden document analysis and Verso navigation ejgallego/rosetta#1 and provide shared plain Verso/Blueprint generator examples.
• Validate exact-request replay and authored diagnostic mapping, with strict semantic spans, explicit provenance and typed session failures in Rosetta.
• Use Verso-managed occurrence IDs and page-aware definition links; exercise repeated inclusions, multi-page output and nested-page hovers.
• Keep server execution at the explicit generator boundary. Profile and saved-bundle configuration through vbp build remains follow-up work.