Close MKRF legacy decompile and PoC docs lane

[gparadis]

Summary

• closes the MKRF legacy decompile / PoC benchmark lane through Phase 59
• publishes the parent FEMIC MKRF sample-model pages and the private MKRF PoC standalone docs lane
• leaves the next architecture-defining work to Phase 60 under #173

Included work

• completed the legacy MKRF recovery, PoC runtime package, benchmark comparison, and docs publication/handoff slices tracked under #172
• renamed the runtime package to models/mkrf_patchworks_model_poc so it can coexist with the later canonical rebuild
• added parent Sphinx pages for MKRF and extended the PoC docs/claim-boundary/handoff surfaces
• added Windows Arbutus auth workflow support and docs improvements in the parent repo

Validation

• docs contract checks
• parent Sphinx build
• standalone MKRF PoC docs Sphinx build
• focused metadata/runtime checks as recorded in the issue trail and change log

Issue links

• relates to #172
• completes the current docs lane under #175
• hands off next implementation work to #173

Docs publication note

The parent repo GitHub Pages workflow (docs-pages.yml) will rebuild the FEMIC docs on main push, including the new parent MKRF sample-model pages. The standalone private instance docs in external/femic-mkrf-instance/docs/ are wired separately via .readthedocs.yaml in the instance repo.