Research-Stack/6-Documentation/docs/semantics/SUSPECT_MODULE_AUDIT_HUTTER_COMPRESSION.md

Suspect Module Audit: Hutter Prize Maximum Compression

Date: 2026-04-24 Module: Semantics.HutterMaximumCompression Status: ✅ QUARANTINE LIFTED - All proofs completed Last Updated: 2026-04-24 (all theorems proven, all imports re-enabled)

Summary

The HutterMaximumCompression.lean module implements a maximum compression approach for the Hutter Prize using the Research Stack infrastructure. The module compiles successfully with 0 sorry warnings. All 7 theorems have been completed. Genome18.lean has been fully proven (no sorry). AVMR and UnifiedCompression imports have been re-enabled after fixing type issues.

Completed Theorems

1. streetTransitionCost_bounded

• Status: ✅ COMPLETED
• Proof: Case analysis proving function returns one of three values (0.1, 0.5, or 1.0), then rcases with simp and native_decide

2. rgflowScaleDistance_bounded

• Status: ✅ COMPLETED
• Proof: Case analysis proving function returns one of three values (0.2, 0.5, or 1.0), then rcases with simp and native_decide

3. substrateExecutionCost_bounded

• Status: ✅ COMPLETED
• Proof: Case analysis proving function returns one of three values (0.33, 0.67, or 1.0), then rcases with simp and native_decide

4. foundationVectorDistance_nonneg

• Status: ✅ COMPLETED
• Proof: simp [Semantics.Q16_16.Q16_16.le, Semantics.Q16_16.Q16_16.zero, Semantics.Q16_16.Q16_16.abs, Semantics.Q16_16.Q16_16.add, Semantics.Q16_16.Q16_16.sub, Semantics.Q16_16.Q16_16.div]

5. routeCost_nonneg

• Status: ✅ COMPLETED
• Proof: simp [Semantics.Q16_16.Q16_16.le, Semantics.Q16_16.Q16_16.zero, Semantics.Q16_16.Q16_16.lt]

6. compressionRatio_nonneg

• Status: ✅ COMPLETED
• Proof: split <;> simp [Semantics.Q16_16.Q16_16.le, Semantics.Q16_16.Q16_16.zero]

7. lawfulSymbols_le_emitted

• Status: ✅ COMPLETED
• Proof: apply List.length_filter_le

Additional Suspect Modules

Semantics.Genome18

• Status: ✅ FULLY PROVEN (no sorry)
• Proofs Completed:
  • addr_injective - Proof: ext <;> all_goals <;> apply Fin.ext <;> simp [addr] at h_eq <;> omega
  • addr_range - Proof: omega
• Impact: Resolved - Genome18 address calculation correctness verified

Semantics.AVMR

• Status: ✅ IMPORT RE-ENABLED (no universe issues)
• Issue: Previously thought to have universe level errors
• Resolution: No universe issues in AVMR itself; the issue was with how SpectralSignature was being used in CompressionContext
• Current State: Import enabled, compiles successfully
• Impact: Resolved - AVMR spectral encoding now available

ExtensionScaffold.Compression.UnifiedCompression

• Status: ✅ IMPORT RE-ENABLED (type issues fixed)
• Issue: Float usage in Code structure violated AGENTS.md rule 1.4
• Resolution:
  • Changed sigma_q from Float to Q16_16 in Code structure
  • Added Semantics.Q16_16 import
  • Removed deriving Repr from Code (Q16_16 doesn't have Repr)
  • Fixed codeLUT to use Q16_16 instead of Float
  • Fixed rgflowAnalyzePulse to return Q16_16 instead of Float
  • Fixed comparison on line 263 to use Q16_16.lt instead of Float literal
• Current State: Import enabled, compiles successfully
• Impact: Resolved - Unified compression pipeline now available

Current State

• HutterMaximumCompression.lean: Compiles with 0 sorry warnings (all theorems completed)
• Genome18.lean: Compiles with 0 sorry warnings (fully proven)
• AVMR.lean: Import re-enabled, compiles successfully
• UnifiedCompression.lean: Import re-enabled, compiles successfully

Build Status

✅ Build completed successfully (3299 jobs)
✅ Semantics/HutterMaximumCompression: 0 sorry declarations (all theorems proven)
✅ Semantics/Genome18: 0 sorry declarations (fully proven)
⚠️  Semantics/SSMS: 5 sorry declarations (unrelated)

AGENTS.md Rule 4A.1 Compliance

Per AGENTS.md rule 4A.1, modules with active sorry are suspect. HutterMaximumCompression now has 0 sorry declarations and is no longer suspect. All required verification theorems have been completed.

Recommended Path Forward

✅ QUARANTINE LIFTED - Module is ready for production use. All theorems completed, all imports re-enabled, no sorry placeholders.

Flags

• BUILD_BLOCKER: No (module compiles)
• FLOAT_HOT_PATH: No (uses Q16_16)
• OPEN_STRING_DECISION: No (uses finite types)
• PROOF_HOLE_CORE_IMPORT: No (all theorems proven)
• SHIM_BOUNDARY_RISK: No (no shim dependencies)
• QUARANTINE: No (quarantine lifted)
• EVALUATE_FOR_DELETION: No (module is useful)