ABI Layer 4: prove the FFI result-code seam is injective + faithful#75
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Add Iseriser.ABI.Semantics proving the headline domain property: a generated -iser scaffold is Conformant exactly when all five required components (Manifest, Idris2 ABI, Zig FFI, Codegen, Rust CLI) are present. Conformant is built from genuine Data.List.Elem membership obligations with no catch-all constructor, so a scaffold missing any component has no witness. Includes a sound+complete decConformant : (s) -> Dec (Conformant s), a soundness fact certifyConformantSound, a positive control (completeIsConformant via explicit Elem positions), and a negative control (ffiMissingNotConformant : Not (Conformant ffiMissing)). Non-vacuity confirmed: a deliberately-false Has Ffi witness for the FFI-missing scaffold is rejected by idris2. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Add Iseriser.ABI.Invariants over the existing Layer-2 Semantics model
(Component/Scaffold/Has/Conformant). Two new, deeper, distinct theorems:
1. Generation soundness (correct-by-construction): genScaffold provably
emits (s ** Conformant s) for any LanguageModel, with a corollary
tying it back to the Layer-2 certifier (conformantCertifies).
2. Upward-closure / monotonicity: conformantStable proves Conformance is
preserved under extension, via a genuine Elem-weakening lemma
(elemAppendRight) — an algebraic closure law, not the Layer-2 decision.
Includes a sound+complete Dec (decExtendConformant), a positive control
(extendedGeneratedConformant) and a non-vacuity negative control
(extendedBrokenNotConformant : Not ...). Builds clean with zero warnings;
adversarial false proof rejected. No believe_me/postulate/assert_total.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Add Iseriser.ABI.FfiSeam proving the resultToInt encoding is sound: - intToResult decoder + resultRoundTrip (lossless/faithful encoding) - resultToIntInjective derived from round-trip (distinct outcomes never collide on the wire) - positive controls (concrete decodes by Refl) and a machine-checked non-vacuity control (resultToInt Ok /= resultToInt Error) Genuine total proof: no believe_me/postulate/assert_total/etc. Registered in iseriser-abi.ipkg; package builds clean with zero warnings. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
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Summary
Layer 4 (seal the ABI↔FFI seam): proves the FFI result-code encoding (
resultToInt) is a sound, lossless wire encoding — decoderintToResultwithresultRoundTrip, from whichresultToIntInjectiveis derived. Distinct ABI outcomes never collide on the C wire. Complements the structuralabi-ffi-gate.py.New module
*.ABI.FfiSeam(importsTypes). Positive + non-vacuity controls.Testing
Idris2 0.7.0
--build→ exit 0, zero warnings. Adversarial rejection confirmed.build/removed. Nobelieve_me/postulate/sorry.🤖 Generated with Claude Code
https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Generated by Claude Code