/* ═══════════════════════════════════════════════════════════════════════════
   SovZMOSCheck.pli — ZMOS Spectral Invariant Governance Gate

   SOVEREIGN CONSTRAINTS:
   - Fail-closed: HALT if spectral invariant Δ(t) exceeds threshold
   - Uses WORM-attested Δ(t) from jordan_block.f90 ZMOS integration
   - Zero external dependencies (uses existing sov_monster_kernel.f90 primitives)
   - All governance events WORM-attested before state change

   INTEGRATION:
   - Called by SovFailClosed.pli as additional gate before quantum resource allocation
   - Reads spectral invariant from WORM chain (attested by jordan_block.f90)
   - GREY HAT membrane triggers BEFORE this gate on entropy spike

   Mathematical basis:
   - Δ(t) = min |s_pole - zero_approx| over WORM-attested primes
   - s_pole = log(p)/log(φ⁻¹) from φ-decay thermal monad
   - Threshold: 1e-3 (configurable via policy)
   - Violation means pole-zero collision → spectral instability → HALT

   Prior Art: SnapKitty Foundry Intel (April 14, 2026)
   Original Research Lab: JAB Capital Trust (2021)
   ═══════════════════════════════════════════════════════════════════════════ */

dcl SovZMOSCheck entry (ptr) returns(fixed bin) external;
dcl Blake3Seal entry (char(*), char(*), ptr returns) external;
dcl WormLogGovernance entry (char(*), char(*)) external;
dcl FetchZMOSDeltaTFromWORM entry (ptr) returns(float bin(64)) external;
dcl GetAgentEd25519Key entry returns(char(64) var) external;
dcl AgentHalt entry external;

/* ═══════════════════════════════════════════════════════════════════════════
   ZMOS SPECTRAL GOVERNANCE GATE

   Semantics: Allow quantum execution iff Δ(t) ≤ threshold
   - Δ(t) fetched from WORM chain (attested by jordan_block.f90 after JST)
   - Threshold = 1e-3 (pole-zero proximity safety margin)
   - Violation → WORM-attest + halt agent (fail-closed, no state corruption)
   ═══════════════════════════════════════════════════════════════════════════ */

ZMOSSpectralGate: proc(options(main));
  dcl SPECTRAL_PTR ptr;
  dcl DELTA_T float bin(64);
  dcl IS_SAFE fixed bin;
  dcl THRESHOLD float bin(64) init(1.0e-3);
  dcl AGENT_KEY char(64) var;
  dcl DENIAL_REASON char(200) var;

  SPECTRAL_PTR = GetLatestWORMSpectralPtr();
  DELTA_T = FetchZMOSDeltaTFromWORM(SPECTRAL_PTR);
  AGENT_KEY = GetAgentEd25519Key();

  /* ─────────────────────────────────────────────────────────────────────
     FAIL-CLOSED SPECTRAL GATE
     Default: DENIED (IS_SAFE starts at 0)
     Must PROVE spectral stability to allow execution
     ───────────────────────────────────────────────────────────────────── */
  IS_SAFE = 0;

  /* Gate: Spectral invariant within safety margin */
  if (DELTA_T <= THRESHOLD) then do;
    IS_SAFE = 1;

    /* WORM-attest APPROVAL (provenance for audit) */
    call WormLogGovernance('ZMOS_SPECTRAL_APPROVED',
     & 'DeltaT=' || char(DELTA_T) || ' Threshold=' || char(THRESHOLD));
  end;
  else do;
    /* VIOLATION: Pole-zero proximity collapsed → spectral instability */
    DENIAL_REASON = 'ZMOS_SPECTRAL_VIOLATION: DeltaT='
                    || char(DELTA_T)
                    || ' Exceeds Threshold=' || char(THRESHOLD);

    /* WORM-attest the DENIAL (immutable audit record) */
    call WormLogGovernance('ZMOS_SPECTRAL_DENIED', DENIAL_REASON);

    /* Seal denial with agent's Ed25519 key */
    call Blake3Seal(
      'ZMOS_FAIL_CLOSED:' || DENIAL_REASON,
      AGENT_KEY,
      null());

    /* Hard halt — agent suspended until spectral stability restored */
    call AgentHalt();
    /* Control never reaches here */
  end;

  return;
end ZMOSSpectralGate;

/* ═══════════════════════════════════════════════════════════════════════════
   HELPER: SovZMOSCheck (Fortran-callable via C ABI)

   Called by sov_monster_kernel.f90 as pre-execution gate
   Reads latest WORM-attested spectral invariant
   Returns: 1 = spectrally stable (safe), 0 = unstable (denied)
   ═══════════════════════════════════════════════════════════════════════════ */

SovZMOSCheck: proc(spectral_ptr) returns(fixed bin);
  dcl spectral_ptr ptr;
  dcl delta_t float bin(64);
  dcl threshold float bin(64) init(1.0e-3);

  /* Fetch WORM-attested spectral invariant */
  delta_t = FetchZMOSDeltaTFromWORM(spectral_ptr);

  /* Fail-closed: default deny */
  if (delta_t > threshold) then return(0);

  /* Spectral stability confirmed */
  return(1);
end SovZMOSCheck;