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abi(affinescriptiser): add Layer-5 end-to-end ABI soundness capstone
New module Affinescriptiser.ABI.Capstone assembles the existing lower-layer proofs into one inhabited certificate `abiContractDischarged : ABISound`: * flagship = safeTraceAffineOk (Layer 2: AffineOk [0,1,2]) * invariant = composedOk (Layer 3: concatAffine composition) * seamInjective = resultToIntInjective (Layer 4: FFI seam injectivity) If any prior layer were unsound, this value would not typecheck. Genuine composition only — no believe_me/postulate/assert_total/sorry/%hint. Adversarial false certificates (constant-Refl seam; bogus double-use flagship) are both rejected by the type checker. Builds clean, 0 warnings. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
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‎src/interface/abi/Affinescriptiser/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 — END-TO-END ABI SOUNDNESS CERTIFICATE for Affinescriptiser.
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|||
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||| This capstone does NOT prove a new domain theorem. It ASSEMBLES the proofs
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||| already discharged in the lower layers into ONE inhabited record value. The
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||| certificate ties the whole ABI contract together:
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|||
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||| manifest (the affine-usage model: `Trace` / `AffineOk`)
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||| -> Layer 2 FLAGSHIP property : a single program fragment uses every
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||| variable at most once (`AffineOk`, witnessed on the canonical
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||| positive-control instance `safeTraceAffineOk : AffineOk [0,1,2]`).
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||| -> Layer 3 INVARIANT : the composition law — sequencing two affine,
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||| variable-disjoint fragments stays affine (`concatAffine`, witnessed
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||| on the canonical positive control `composedOk : AffineOk [0,1,2,3]`).
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||| -> Layer 4 FFI SEAM : the ABI<->C `Result` encoding is unambiguous, so
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||| distinct ABI outcomes never collide on the wire
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||| (`resultToIntInjective`).
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|||
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||| Each field below is filled ONLY from an already-`export`ed witness/theorem of
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||| the modules it imports — nothing is re-proved or fabricated here. The single
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||| value `abiContractDischarged : ABISound` is therefore the capstone: if ANY
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||| prior layer were unsound (the flagship witness, the invariant witness, or the
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||| seam injectivity), this value would fail to typecheck and the certificate
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||| could not be issued. Genuine composition only: no believe_me, no idris_crash,
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||| no assert_total, no postulate, no sorry, no %hint hacks, no asserted equality.
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module Affinescriptiser.ABI.Capstone
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import Affinescriptiser.ABI.Types
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import Affinescriptiser.ABI.Semantics
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import Affinescriptiser.ABI.Invariants
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import Affinescriptiser.ABI.FfiSeam
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%default total
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--------------------------------------------------------------------------------
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-- The certificate type
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--------------------------------------------------------------------------------
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||| `ABISound` records the KEY proven facts of the Affinescriptiser ABI, one
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||| field per proof layer. Inhabiting it requires a genuine witness of each.
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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): the canonical positive-control program fragment
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||| [0,1,2] is affine-safe — every variable used at most once.
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flagship : AffineOk [0, 1, 2]
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||| Layer 3 (invariant): the composition law applied to the canonical
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||| disjoint fragments yields an affine-safe sequenced fragment [0,1,2,3].
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invariant : AffineOk ([0, 1] ++ [2, 3])
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||| Layer 4 (FFI seam): the ABI<->C `Result` encoding is injective, i.e.
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||| equal wire integers imply equal ABI outcomes (distinct outcomes never
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||| collide). Carried as the full injectivity theorem.
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seamInjective : (a, b : Result) -> resultToInt a = resultToInt b -> a = b
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--------------------------------------------------------------------------------
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-- The capstone value: the whole ABI contract, discharged together
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--------------------------------------------------------------------------------
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||| THE CAPSTONE. A single inhabited certificate built entirely from the
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||| lower-layer exported witnesses:
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||| * `flagship` = `safeTraceAffineOk` (Layer 2 positive control)
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||| * `invariant` = `composedOk` (Layer 3 composition control)
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||| * `seamInjective` = `resultToIntInjective` (Layer 4 seam theorem)
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||| Typechecking this value is exactly the end-to-end soundness statement.
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public export
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abiContractDischarged : ABISound
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abiContractDischarged =
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MkABISound safeTraceAffineOk composedOk resultToIntInjective

‎src/interface/abi/affinescriptiser-abi.ipkg‎

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, Affinescriptiser.ABI.Semantics
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, Affinescriptiser.ABI.Invariants
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, Affinescriptiser.ABI.FfiSeam
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, Affinescriptiser.ABI.Capstone

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