ABI Layer 5: end-to-end soundness capstone certificate#178
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Add Verisimiser.ABI.Invariants, a second, deeper machine-checked theorem over the existing Octad model (distinct from the Layer-2 Octad<->Fin 8 bijection). Models the write effect of an augmentation *pipeline* as a join over a two-point lattice (ReadOnly <= Writes, Writes absorbing) and proves: - effectHomomorphism: pipelineEffect is a monoid homomorphism from list append to joinE (with joinAssoc / identity laws). - tier1PipelineReadOnly (CLOSURE): any pipeline of only Tier-1 dimensions is read-only -- isolation is preserved under composition (reuses Layer-2 tier1NeverWritesTarget). - writerContaminates (CONTAMINATION) + appendMonotone (MONOTONICITY): one target-writing step taints the whole pipeline. - decReadOnly: sound + complete decision procedure. - Positive control (readPathIsReadOnly) + negative controls (overlayNotReadOnly, decOverlayIsNo, effectsDistinct). No believe_me/postulate/assert_total/etc. Builds with zero warnings; adversarial false-proof rejected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Prove the FFI result-code encoding is SOUND, not just structurally name/value-matched by scripts/abi-ffi-gate.py: - intToResult decoder + resultRoundTrip: resultToInt is faithful/lossless (every Result round-trips back from its C integer). - resultToIntInjective: DERIVED from the round-trip via cong + justInj (distinct ABI outcomes never collide on the wire). - Positive controls (decode 0/7/99 by Refl) and a machine-checked non-vacuity control (Ok and Error encode to distinct ints). - (c) Same injectivity for every other FFI enum encoder in Types: octadToInt, backendToInt, provenanceOpToInt, driftToInt, accessPolicyToInt (no ProofStatus/statusToInt in this repo). Genuine total proof: no believe_me/postulate/assert_total/etc. Builds clean (idris2 0.7.0, 0 warnings); false seam claims rejected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Assemble the existing per-layer proofs into one inhabited certificate value
in Verisimiser.ABI.Capstone:
- ABISound record: one field per discharged layer
* flagship octad bijection (Layer-2 Octad.idr): octadFinInverseL/R
* compositional sidecar-isolation invariant (Layer-3 Invariants.idr):
readPathIsReadOnly on the canonical positive-control pipeline
* FFI-seam injectivity (Layer-4 FfiSeam.idr): resultToIntInjective
- abiContractDischarged : ABISound, built solely from real exported witnesses.
Typechecks iff every prior layer remains sound; a false field (e.g. claiming
the overlay pipeline is read-only) is rejected by the type checker.
Pure composition: no believe_me/postulate/assert/idris_crash. %default total,
zero build 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 5 (the capstone, completing the 5-layer proof track): a new
Verisimiser.ABI.Capstonemodule importing every prior layer and assembling a single inhabitedABISoundcertificate (abiContractDischarged) from the real exported witnesses of the flagship property (L2Octadbijection), the deeper invariant (L3 compositional sidecar isolation), and the FFI-seam injectivity (L4). One end-to-end soundness statement.Genuine composition only — reuses real exported names.
Testing
Idris2 0.7.0
--build→ exit 0, zero warnings. Adversarial: a bogus-field certificate was rejected.build/removed. Nobelieve_me/postulate/sorry.🤖 Generated with Claude Code
https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Generated by Claude Code