[RFT-SIRM]

Summary

• Promote Phi-Genesis, the Sierpiński QPU architecture, and SIRM Financial Infrastructure into the central UltraCore-RFT development portfolio.
• Update the root README, MkDocs homepage, research map, architecture diagram, and navigation consistently.
• Keep proof, numerical-model, pre-experimental, and production-readiness boundaries explicit.
• Preserve the QPU repository's separate BUSL-1.1 licensing boundary; no source code, Lean files, Python files, workflows, or badges were changed.

Validation

• Exact-anchor content assertions passed before commit.
• Documentation-only change across five Markdown/YAML files.
• Docs CI (mkdocs build --strict) should validate the rendered site on this PR.
• No Lean build or large dependency download is required for this documentation-only change.