plugin/evm: remove deprecated DexZap live-backend wiring; precompile v0.5.49

The C-Chain DEX settles certified D-Chain fill receipts at the 0x9999 precompile
(LP-9999); it never queries a live matcher. Remove the deprecated
DexZapEndpoint -> SetBackend(NewZAPEngine()) wiring from vm.go and the
DexZapEndpoint config knob: a synchronous in-block ZAP query against the
D-Chain's moving book forks consensus (each validator observes differently-timed
fills -> divergent StateRoot, proven by chains/dexvm
TestRED_PerValidatorRelay_SplitsConsensus). ZAP survives only as the dexvm's own
build-path transport, never as a C-Chain live backend. Receipts ride in V4 swap
hookData and are verified inline (deterministic BLS).

Bump github.com/luxfi/precompile v0.5.47 -> v0.5.49 to embed the complete,
red-swarm-hardened 0x9999 receipt-settlement surface.

Author: zeekay

go.mod

@@ -32,7 +32,7 @@ require (
 	github.com/luxfi/metric v1.5.8
 	github.com/luxfi/p2p v1.21.1
 	github.com/luxfi/pq v1.0.3
-	github.com/luxfi/precompile v0.5.47
+	github.com/luxfi/precompile v0.5.49
 	github.com/luxfi/runtime v1.1.1
 	github.com/luxfi/sys v0.1.0
 	github.com/luxfi/timer v1.0.2

go.sum

@@ -276,8 +276,8 @@ github.com/luxfi/p2p v1.21.1 h1:gmz1JMDhzHIL3dQlhwIDvR4OlFuhNVfnWUl/ipYhAIo=
 github.com/luxfi/p2p v1.21.1/go.mod h1:SsNPR5fPGWWNem9plGWhSmRqyDoysJ3kPAN0zG0g3iw=
 github.com/luxfi/pq v1.0.3 h1:pFlQm1+5FuKTDUh2y/23bXWkN4I2Rc5iuxJypwDFFMs=
 github.com/luxfi/pq v1.0.3/go.mod h1:8bppZcRElfrVt0n3nYCZW3iX1TvhvzNbdjNdK1irgIE=
-github.com/luxfi/precompile v0.5.47 h1:YeigusKzHzYTc5xdT4w33WMH9pPd773LyrjUKoqVzJg=
-github.com/luxfi/precompile v0.5.47/go.mod h1:X5QPX4y/Q9AQn5gqO+BrscKPX2R/FOUtINx/bGqutqA=
+github.com/luxfi/precompile v0.5.49 h1:WvrSBsNdhdydmz7RxiGH6AdICOQk/A/UKlCP6KWpfbg=
+github.com/luxfi/precompile v0.5.49/go.mod h1:aR523IXj+VQAIU1CYP/64dVwKK93DDssHj1tGFdzLTY=
 github.com/luxfi/proto v1.3.4 h1:dNrdQ/414Pe9otIekVUmQ9QLqemaMFK43H4N3DIbuzQ=
 github.com/luxfi/proto v1.3.4/go.mod h1:S80KrTzISCktptit/pWLzk6nHgagjJS86qbQL6gHutE=
 github.com/luxfi/resource v0.0.1 h1:mTh+ICWSy548GTUSSyx7V/X5dV18oEwxZeQEYGJQhD4=

plugin/evm/config/config.go

@@ -290,18 +290,12 @@ type Config struct {
 	// the older flag names.
 	PQ bool `json:"pq,omitempty"`
 
-	// DexZapEndpoint points the DEX precompile (LP-9010 V4 PoolManager) at a
-	// node-local D-Chain (dexvm) over ZAP instead of the in-process embedded
-	// engine. Empty (the default) keeps the embedded engine — current behavior,
-	// fully self-contained, no external dependency.
-	//
-	// CONSENSUS SAFETY: this is consensus-deterministic ONLY when every
-	// validator runs the IDENTICAL node-local D-Chain at the IDENTICAL pinned
-	// version. The endpoint MUST be node-local (e.g. a loopback/unix socket to
-	// the dexvm on the same host) and version-pinned across the validator set —
-	// a remote or version-skewed backend produces divergent state and forks the
-	// chain. Operators flipping this knob own that invariant.
-	DexZapEndpoint string `json:"dex-zap-endpoint"`
+	// NOTE: the former DexZapEndpoint knob is REMOVED. The C-Chain DEX precompile
+	// (0x9999) settles certified D-Chain fill receipts INLINE (deterministic BLS
+	// verify); it never points at a live matcher backend (a synchronous in-block
+	// query against the D-Chain's moving book forks consensus). The dexvm's ZAP
+	// transport is internal to chains/dexvm and not configured here. See
+	// precompile/dex/settle9999.go.
 }
 
 // TxPoolConfig contains the transaction pool config to be passed

plugin/evm/config/config_test.go

@@ -71,17 +71,6 @@ func TestUnmarshalConfig(t *testing.T) {
 			Config{StateSyncIDs: "NodeID-CaBYJ9kzHvrQFiYWowMkJGAQKGMJqZoat"},
 			false,
 		},
-		{
-			// The DEX ZAP flip is configurable: a set endpoint decodes into the
-			// field that vm.go gates the SetBackend(NewZAPEngine(...)) call on.
-			// Empty (the zero-value default, covered by the empty-config cases
-			// above) leaves the embedded engine = the inert, self-contained
-			// default a public node runs.
-			"dex zap endpoint set",
-			[]byte(`{"dex-zap-endpoint": "127.0.0.1:9099"}`),
-			Config{DexZapEndpoint: "127.0.0.1:9099"},
-			false,
-		},
 		{
 			"empty transaction history ",
 			[]byte(`{}`),

plugin/evm/vm.go

@@ -75,7 +75,6 @@ import (
 	// Force-load precompiles to trigger registration
 	_ "github.com/luxfi/evm/precompile/registry"
 
-	dexprecompile "github.com/luxfi/precompile/dex"
 
 	"github.com/luxfi/geth/common"
 	"github.com/luxfi/geth/ethdb"
@@ -401,19 +400,16 @@ func (vm *VM) Initialize(ctx context.Context, init block.Init) error {
 		}
 	}
 
-	// Wire the DEX precompile backend BEFORE genesis/pool init. SetBackend
-	// errors once any pool state exists, so it MUST run before parseGenesis.
-	// Empty endpoint = embedded engine (the package default) — opt-in flip,
-	// dormant until configured. When set, point the LP-9010 PoolManager at the
-	// node-local D-Chain (dexvm) over ZAP so any Lux-derived EVM shares one
-	// unified DEX. See config.DexZapEndpoint for the consensus-safety invariant.
-	if vm.config.DexZapEndpoint != "" {
-		engine := dexprecompile.NewZAPEngine(vm.config.DexZapEndpoint, 2*time.Second)
-		if err := dexprecompile.SetBackend(engine); err != nil {
-			return fmt.Errorf("failed to install DEX ZAP backend at %q: %w", vm.config.DexZapEndpoint, err)
-		}
-		log.Info("DEX precompile backend installed", "brand", engine.Brand(), "endpoint", vm.config.DexZapEndpoint)
-	}
+	// DEX settlement model (settled architecture): the C-Chain DEX precompile
+	// SETTLES certified D-Chain fill receipts at 0x9999; it does NOT query a live
+	// matcher backend. The deprecated DexZapEndpoint -> SetBackend(NewZAPEngine())
+	// wiring is REMOVED — a synchronous in-block ZAP query against the D-Chain's
+	// moving order book forks consensus (each validator observes differently-timed
+	// fills => divergent StateRoot, proven by chains/dexvm TestRED_PerValidator
+	// Relay_SplitsConsensus). ZAP survives ONLY as the dexvm's own build-path
+	// transport (chains/dexvm), never as a C-Chain live backend. Receipts ride in
+	// the V4 swap hookData and are verified inline (deterministic BLS), so there is
+	// no backend to install here. See precompile/dex/settle9999.go.
 
 	debugLog("Calling parseGenesis with genesisAllocFile=%q, upgradeBytes len=%d", vm.config.GenesisAllocFile, len(upgradeBytes))
 	fmt.Fprintf(os.Stderr, "[GENESIS-BYTES-DEBUG] len=%d first500=%s\n", len(genesisBytes), string(genesisBytes[:min(500, len(genesisBytes))]))