Types.idr: pre-existing type-check failures block module build #2

Discovered while closing proof-debt in src/abi/Layout.idr (commit 02c2c85). Three pre-existing type errors in src/abi/Types.idr prevent the ABI modules from type-checking cleanly.

Failures

1. programStateSizeBytes not accessible — Types.idr:265

   programStateSize : HasSize ProgramState programStateSizeBytes
   programStateSize = SizeProof
   

   Error: programStateSizeBytes is not accessible in this context.
   Likely needs public export on programStateSizeBytes (currently public export on the binding declaration but accessibility flagged at the SizeProof site — possibly namespace or reducibility issue).

2. instructionSizeBytes not accessible — Types.idr:280 — same shape as above.

3. Bits (ptrSize p) kind mismatch — Types.idr:321

   CPtr : Platform -> Type -> Type
   CPtr p _ = Bits (ptrSize p)
   

   Error: Mismatch between: Nat and Type.
   Bits in Data.Bits is a type-class parameterised by a Type, not a constructor taking a Nat. Should probably use Bits32/Bits64 selected by the platform, or a different dependent bit-vector type.

Reproduction

idris2 --check --source-dir src src/abi/Layout.idr

or in isolation:

mkdir -p /tmp/az/AbsoluteZero/ABI
cp src/abi/{Types,Layout}.idr /tmp/az/AbsoluteZero/ABI/
cd /tmp/az && idris2 --check --source-dir . AbsoluteZero/ABI/Layout.idr

Notes

• The module-path mismatch (files in src/abi/ but declared AbsoluteZero.ABI.*) is a separate build-config issue — ipkg missing from repo root. That blocks a canonical idris2 --build invocation entirely. Might be worth adding an .ipkg alongside this fix.
• No .ipkg file exists anywhere in the repo — confirmed via find.
• Not related to proof debt; this is a preservation-of-types bug, separate from formal-verification work.