# Dead Code Archive — 2026-07-03

Files removed from the active build. All contain sorries, `native_decide` calls,
or are otherwise incomplete. Archived for reference; not compiled by `lake build`.

## Removed Modules

| File | Lines | Reason |
|------|-------|--------|
| `CoreFormalism/CharacterTransform.lean` | — | Not in lakefile; unverified character table |
| `PVGS_DQ_Bridge/` (8 .lean + 1 .py) | ~3000 | Commented out in lakefile; 979-case enumeration sorries |
| `UniversalEncoding/` (2 .lean) | ~600 | Not in lakefile; chirality space stubs |
| `SilverSight/PIST/SpectralWitness.lean` | — | Not in lakefile; witness-only, no theorems |
| `SilverSight/Bind.lean` | — | Not in lakefile; quaternion bindings with sorries |
| `SilverSight/FeasibleSet/TestChain.lean` | — | Not in lakefile; test-only, no formal content |

## PVGS_DQ_Bridge Details

The PVGS (Pólya-Vinogradov / Goormaghtigh / Sidon) bridge contained
significant formalization effort (7 sections + master receipt) but was
blocked on:
- BMS region enumeration (979 cases, T4.1)
- Hermite sieve verification (T4.2)
- Quantum sensing distinguishability bound

All 18 axioms in this directory carried HONESTY CLASS tags. The math
is correct but the finite enumeration was never completed.

## UniversalEncoding Details

ChiralitySpace and UniversalMathEncoding stubs for a proposed
"universal math receipt" encoding LaTeX expressions into 16D space.
Never integrated into the active build.

## Recovery

To restore any file: `cp archive/dead_code_2026-07-03/<path> formal/<path>`
Then add the corresponding entry to `lakefile.lean`.
