Record public LFL20 proof bundle publication

[rovsh44-glitch]

Summary

• records the published public LFL20 proof-bundle repo
• updates current-state and security/public-visibility docs to point at the private-core baseline tag and public proof surface
• closes the stale docs state after PR Close dependency security and private-core posture #43 and hosted green checks

Public proof repo: https://github.com/rovsh44-glitch/helper-proof-bundle-lfl20

Private baseline tag: helper-private-core-2026-04-15-green

Verification

• powershell -ExecutionPolicy Bypass -File scripts/check_docs_entrypoints.ps1
• public proof bundle sanitized scan found no local paths, auth/runtime IDs, raw request envelopes, or system instructions