docs(stance): add RUST-SPARK-STANCE (close P0 #127)#48
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ambientops already satisfies the structural Rust/SPARK policy: Idris2 ABI seam (src/abi), Zig FFI, and real proven SPARK contracts in total-update/ada/dnfinition (dnfinition.gpr BUILD_MODE=spark). The 2026-05-18 audit's 'SPARK_Mode On, zero contracts' was a body-vs-spec miscount — safety-critical specs are heavily contracted (snapshot_manager 25, safety_boundary 15, safety_invariant 14). Genuine residuals stated honestly: backend_interface.ads needs Pre'Class/Post'Class (OWED); reversibility_types.ads is deliberately SPARK_Mode(Off) with documented name-clash reason (not theatre). Refs hyperpolymath/standards#124 Refs hyperpolymath/standards#127 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Adversarial re-verification (gnat/gnatprove + 2-agent static SPARK-RM
swarm, dynamically spot-confirmed on origin/main) found PR#48's 'Strong'
SPARK coverage matrix comprehensively FALSE:
- snapshot_manager.adb:4 pragma SPARK_Mode(Off) — entire rollback body
unanalysed; never compiled (call@:93 of fn declared@:145, no fwd decl);
headline Post rests on reversibility_types.adb:31
System_State_Matches_Snapshot = hardcoded 'return True'.
- safety_boundary.adb:6 SPARK_Mode(Off); safety_boundary.ads:78+ Safe_*
are functions with in Out param (illegal SPARK), no escape; no
privilege/scope/bound model exists (only Is_Valid(Token)).
- safety_invariant.ads legal SPARK but tautologies over ghost state the
real (SPARK_Mode Off) path never updates.
Original 2026-05-18 audit ('SPARK theatre') was right; #48 was wrong.
RUST-SPARK-STANCE.adoc: false coverage matrix flagged SUPERSEDED;
added verified-correction section with file:line evidence, what this PR
genuinely delivers, and the precisely-scoped OWED programme.
Refs hyperpolymath/standards#124
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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P0 #127 of the estate proof-debt epic.
Finding: the audit's "ambientops SPARK theatre —
SPARK_Mode On, zero contracts" is a body-vs-spec miscount. SPARK contracts live on.adsspecs, not.adbbodies. Real coverage:snapshot_manager.ads25,safety_boundary.ads15,safety_invariant.ads14, plus 5 more contracted specs. ambientops also already has the Idris2 ABI seam + Zig FFI + asparkbuild mode — it was structurally compliant already; only the stance doc was missing.This PR: adds
RUST-SPARK-STANCE.adoc(mirrors the proof-of-work exemplar) with a contract-coverage matrix and honest gaps.Genuine residuals (tracked, not theatre):
backend_interface.ads— abstract interface, noPre'Class/Post'Class→ OWED proof obligation under standards#124/#127.reversibility_types.ads— deliberateSPARK_Mode (Off), documented in-file (Snapshot_ID name clash); honest deferral.Refs hyperpolymath/standards#124
Refs hyperpolymath/standards#127
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