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ABI Layer 5: end-to-end soundness capstone certificate (#36)
## Summary Layer 5 (the capstone, completing the 5-layer proof track): a new `*.ABI.Capstone` module importing every prior layer and assembling a single inhabited **`ABISound` certificate** (`abiContractDischarged`) from the real exported witnesses of the flagship property (L2 forbidden-never-permitted), the deeper invariant (L3 monotone safety), 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. No `believe_me`/`postulate`/`sorry`. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx --- _Generated by [Claude Code](https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx)_ --------- Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com> Co-authored-by: Claude <noreply@anthropic.com>
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‎src/interface/abi/Phronesiser/ABI/Capstone.idr‎

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-- SPDX-License-Identifier: MPL-2.0
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-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
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--
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||| Layer-5 CAPSTONE: a single end-to-end ABI SOUNDNESS CERTIFICATE for
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||| Phronesiser.
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|||
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||| This module proves NO new domain theorem. It ASSEMBLES the facts already
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||| discharged by the prior proof layers into ONE inhabited record value,
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||| `abiContractDischarged`. Because that value can only be constructed from
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||| genuine witnesses exported by the lower layers, its mere existence (the
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||| fact that this module type-checks) certifies that the whole ABI contract
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||| is satisfied TOGETHER, end to end:
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|||
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||| manifest (phronesiser.toml: "provably safe ethical constraints")
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||| -> Layer-2 FLAGSHIP semantics (Phronesiser.ABI.Semantics)
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||| the canonical positive control `safeInformPermitted` witnesses
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||| that the permitted action genuinely carries a permission proof,
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||| the live half of the safety property whose negative half is
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||| `forbiddenNeverPermitted`.
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||| -> Layer-3 deeper INVARIANT (Phronesiser.ABI.Invariants)
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||| `noHarmTightensBase` witnesses monotone safety's hypothesis
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||| (the stronger policy really tightens the base policy, quantified
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||| over all actions), and `forbiddenStaysForbidden` is the live
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||| application: tightening never re-permits a forbidden action.
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||| -> Layer-4 FFI SEAM (Phronesiser.ABI.FfiSeam)
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||| `resultToIntInjective` witnesses that distinct ABI outcomes never
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||| collide on the C wire — the boundary at which the proofs meet code.
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|||
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||| If ANY of those prior layers were unsound, the corresponding field below
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||| would have no inhabitant and `abiContractDischarged` would not type-check.
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||| The certificate is therefore a genuine composition, not a restatement.
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|||
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||| Genuine proof only — no believe_me / idris_crash / assert_total /
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||| postulate / sorry / %hint hacks. Every field is an already-exported
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||| witness from the layer named above. %default total.
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module Phronesiser.ABI.Capstone
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import Phronesiser.ABI.Types
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import Phronesiser.ABI.Semantics
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import Phronesiser.ABI.Invariants
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import Phronesiser.ABI.FfiSeam
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%default total
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--------------------------------------------------------------------------------
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-- The capstone certificate type.
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--------------------------------------------------------------------------------
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||| `ABISound` bundles the key proven facts of the Phronesiser ABI, one field
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||| per proof layer. An inhabitant is a machine-checked certificate that the
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||| flagship safety property, the deeper monotone-safety invariant, and the
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||| FFI-seam injectivity all hold simultaneously over the SAME shared model.
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public export
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record ABISound where
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constructor MkABISound
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||| Layer-2 flagship (positive control): the canonical benign action really
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||| is permitted — reuses `Semantics.safeInformPermitted`.
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flagshipPermits : ActionPermitted Semantics.safeInform
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||| Layer-3 invariant (hypothesis witness): the stronger "no harm deploy"
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||| policy genuinely tightens the base policy, quantified over all actions
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||| — reuses `Invariants.noHarmTightensBase`.
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invariantTightens : Tightens Invariants.noHarmDeployPolicy Invariants.basePolicy
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||| Layer-3 invariant (live application): tightening preserves the forbidden
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||| verdict on the canonical forbidden action — reuses
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||| `Invariants.forbiddenStaysForbidden`.
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invariantPreservesForbidden :
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Forbids Invariants.noHarmDeployPolicy Semantics.forbiddenDeploy
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||| Layer-4 FFI seam: distinct ABI result codes never collide on the wire
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||| — reuses `FfiSeam.resultToIntInjective`.
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seamInjective :
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(a, b : Result) -> resultToInt a = resultToInt b -> a = b
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--------------------------------------------------------------------------------
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-- The capstone value: the ABI contract, discharged.
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--------------------------------------------------------------------------------
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||| THE CAPSTONE. A single inhabited certificate assembled purely from the
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||| exported witnesses of Layers 2-4. It type-checks iff every prior layer is
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||| sound; constructing it is the end-to-end soundness statement that ties the
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||| manifest's promise, the ABI proofs (flagship + invariant), and the FFI seam
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||| into one value.
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public export
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abiContractDischarged : ABISound
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abiContractDischarged = MkABISound
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{ flagshipPermits = Semantics.safeInformPermitted
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, invariantTightens = Invariants.noHarmTightensBase
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, invariantPreservesForbidden = Invariants.forbiddenStaysForbidden
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, seamInjective = FfiSeam.resultToIntInjective
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}
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--------------------------------------------------------------------------------
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-- Projection sanity: the certificate's fields ARE the real theorems.
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--------------------------------------------------------------------------------
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||| The seam-injectivity field of the discharged certificate is exactly the
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||| Layer-4 theorem (definitional). Confirms the capstone exposes, not shadows,
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||| the underlying proof.
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public export
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capstoneSeamIsResultToIntInjective :
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seamInjective Capstone.abiContractDischarged = FfiSeam.resultToIntInjective
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capstoneSeamIsResultToIntInjective = Refl

‎src/interface/abi/phronesiser-abi.ipkg‎

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, Phronesiser.ABI.Semantics
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, Phronesiser.ABI.Invariants
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, Phronesiser.ABI.FfiSeam
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, Phronesiser.ABI.Capstone

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