Align methodology with active v0.1.3

[AMBRA7592]

Summary

• describe v0.1.3 as the active production generation rather than a pending correction
• distinguish its active production status from the still-pending GitHub Release and Zenodo publication
• state the frozen v0.1.3 source-closure split: 80 of 109 memberships patch-decidable, 29 requiring registry-sourced slices

Scope

Documentation-only. This changes only frontend/src/pages/methodology.astro. It does not modify runtime logic, schemas, frozen packages, manifests, implementation-hashed sources, deployments, GitHub Releases, or Zenodo metadata.

Verification

• npm run check (0 errors, 0 warnings, 0 hints)
• npm run build
• git diff --check