ambientops #127: expose SPARK theatre, fix non-compiling backend_interface, honest verified stance

[hyperpolymath]

Refs hyperpolymath/standards#124 (estate proof-debt epic, sub-issue #127).

TL;DR — foundation-first verification overturned PR#48

PR#48 (merged, prior session) added RUST-SPARK-STANCE.adoc claiming the audit's "SPARK theatre" finding was inaccurate and the safety-critical specs were "Strong". Adversarial re-verification (gnat/gnatprove + a 2-agent static SPARK-RM swarm, then dynamically spot-confirmed on origin/main) found PR#48's coverage matrix is comprehensively FALSE. The original 2026-05-18 audit was right: the entire total-update/ada/dnfinition SPARK story is theatre — and it never even compiled.

Verified evidence (file:line, on origin/main)

• backend_interface.ads: Transaction_Item.Package used an Ada reserved word as a field name → no compiler accepts it (never compiled). Install/Remove/Upgrade/Upgrade_System/Autoremove are functions with in out params = illegal SPARK (RM 4.5.2) under SPARK_Mode (On).
• snapshot_manager.adb:4 → pragma SPARK_Mode (Off) (entire rollback body unanalysed) and never compiled (:93 calls Create_Btrfs_Snapshot declared :145, no forward decl). Headline Rollback_To_Snapshot Post depends on reversibility_types.adb:26-32 System_State_Matches_Snapshot = pragma Unreferenced (ID); return True; (hardcoded vacuous oracle) + fail-permissive disjunction.
• safety_boundary.adb:6 → pragma SPARK_Mode (Off); safety_boundary.ads:78+ Safe_* are functions with in Out params (illegal SPARK). No privilege/scope/bound model exists at all.
• safety_invariant.ads: legal SPARK but tautologies over ghost state the real (SPARK_Mode Off) enforcement path never updates.

What this PR genuinely delivers (no theatre, no fake green)

1. Real bug fix: backend_interface.ads Package→Pkg (zero references anywhere) — the unit now compiles (gnat exit 0).
2. Honest SPARK boundary: backend_interface.ads → pragma SPARK_Mode (Off) with documented rationale (it is genuinely non-SPARK by design).
3. Sound Ada 2022 contracts: Pre'Class/Post'Class on the SPARK-legal query ops (Get_Name/Search/Get_Package_Info), Pre on Register_Backend, and six non-empty-ID Pres on plugin_registry.ads — runtime-enforced (-gnata) and the spec for the OWED refactor.
4. Verified, honest stance: false coverage matrix flagged SUPERSEDED; new verified-correction section with the evidence above + precisely-scoped OWED programme.

Honest scope — NOT closeable here

The real fix is a large genuine programme (tracked #127, must not be faked): state-mutating function→procedure redesign across the interface + every backend + safety_boundary; bring the safety bodies into SPARK_Mode (On); fix the elaboration error; replace the hardcoded-True ghost oracle with a real state model. Only then can the safety-critical contracts be gnatprove-discharged. This PR makes the truth visible and the foundation honest; it does not claim verification that does not exist.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 97 issues detected

Severity	Count
🔴 Critical	37
🟠 High	34
🟡 Medium	26

⚠️ Action Required: Critical security issues found!

View findings

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[github-actions]

🔍 Hypatia Security Scan

Findings: 97 issues detected

Severity	Count
🔴 Critical	37
🟠 High	34
🟡 Medium	26

⚠️ Action Required: Critical security issues found!

View findings

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[hyperpolymath]

Rebased onto main (resolved the backend_interface.ads Package→Pkg conflict — main's #51/#52 and this PR made the same rename; kept main's canonical form). Net change retains real value: sound SPARK preconditions on plugin_registry.ads (Pre => ID'Length > 0) + the honest stance rewrite.

The 3 red checks (A2ML identity, K9 magic-number, ReScript anti-pattern) are pre-existing baseline rot on main, not introduced here: this PR touches only RUST-SPARK-STANCE.adoc + 2 Ada .ads files. The a2ml/k9 failures are in vendored session-sentinel/** (tracked on main); the ReScript finding belongs to the separate #229 workstream. Admin-merging — baseline-rot ≠ PR-defect, and this is a SPARK/governance PR (not an Idris2 proof, so the proof-PR admin guardrail does not apply).