precompile: fix stale P3Q-as-STARK comments + align chain-slot nibble to genesis registry

P3Q (0x012205) is the rollup-commit PQ verifier (kind-byte dispatch to
Pulsar/Corona/Magnetar), NOT a STARK — STARK-FRI is at 0x012220. Correct
three stale comments (magnetar, modules/registerer, fhe/dos_audit) that
labeled 0x012205 a STARK. Align the registry.go C-nibble doc-comment to
the authoritative node/genesis/builder/registry.go: remove phantom
M-Chain, add D-Chain at C=3, mark Zoo/Hanzo/SPC as sovereign-L1 EVM.
Comments only; no constant or VM logic changed. Builds clean.

fhe/dos_audit.go

@@ -76,7 +76,7 @@ var DoSAuditTable = []DoSAuditRow{
 	{Precompile: "vrf/verify", GasPerOp: 50_000, PerOpMs: 1, SafeAt12M: true},
 	// HQC encapsulate — KEM, fast.
 	{Precompile: "hqc/encapsulate", GasPerOp: 25_000, PerOpMs: 1, SafeAt12M: true},
-	// P3Q verify — STARK, ~1ms on M1 Pro per memory record.
+	// P3Q verify — rollup-commit PQ (ML-DSA) signature verify, ~1ms on M1 Pro per memory record.
 	{Precompile: "p3q/verify", GasPerOp: 200_000, PerOpMs: 1, SafeAt12M: true},
 	// FHE Add uint8 — benchmark: BenchmarkFHEAdd_Uint8.
 	//

magnetar/contract.go

@@ -14,10 +14,12 @@
 //	0x012202 = ML-DSA     (Module-LWE single-party signature, FIPS 204)
 //	0x012203 = SLH-DSA    (hash-based single-party signature, FIPS 205)
 //	0x012204 = Pulsar     (Module-LWE threshold FIPS 204, byte-equal)
-//	0x012205 = P3Q        (strict-PQ STARK)
+//	0x012205 = P3Q        (rollup-commit PQ verifier; kind-byte dispatch
+//	                       to Pulsar/Corona/Magnetar — see precompile/p3q, LP-218)
 //	0x012206 = Corona     (Ring-LWE threshold signatures)
 //	0x012207 = Magnetar   ← this precompile (hash-based threshold FIPS 205)
 //	0x012208 = HQC        (code-based KEM, family-disjoint backup)
+//	0x012220 = STARK-FRI  (strict-PQ STARK / FRI — see precompile/starkfri, LP-221)
 //
 // Why a distinct slot if the verifier is interchangeable with SLH-DSA's?
 //

modules/registerer.go

@@ -154,10 +154,12 @@ var (
 		//   0x12202 = ML-DSA    (Module-LWE single-sig, FIPS 204)
 		//   0x12203 = SLH-DSA   (hash-based signature,  FIPS 205)
 		//   0x12204 = Pulsar    (Module-LWE threshold,  FIPS 204 byte-equal)
-		//   0x12205 = P3Q       (strict-PQ STARK)
+		//   0x12205 = P3Q       (rollup-commit PQ verifier; kind-byte dispatch
+		//                        to Pulsar/Corona/Magnetar — LP-218)
 		//   0x12206 = Corona    (Ring-LWE threshold)
 		//   0x12207 = Magnetar  (hash-based threshold,  FIPS 205 byte-equal)
 		//   0x12208 = HQC       (code-based KEM, family-disjoint backup)
+		//   0x12220 = STARK-FRI (strict-PQ STARK / FRI verifier — LP-221)
 		{
 			Start: common.HexToAddress("0x0000000000000000000000000000000000012000"),
 			End:   common.HexToAddress("0x0000000000000000000000000000000000012fff"),

registry/registry.go

@@ -35,18 +35,25 @@ import (
 //   P=7 → LP-7xxx (AI)
 //   P=9 → LP-9xxx (DEX/Markets)
 //
-// C nibble = Chain slot:
-//   C=0 → P-Chain
-//   C=1 → X-Chain
-//   C=2 → C-Chain (main EVM)
-//   C=3 → Q-Chain
-//   C=4 → A-Chain
-//   C=5 → B-Chain
-//   C=6 → Z-Chain
-//   C=7 → M-Chain (reserved)
-//   C=8 → Zoo
-//   C=9 → Hanzo
-//   C=A → SPC
+// C nibble = Chain slot (4-bit address-routing index). The primary-
+// network chain letters are the authoritative set in
+// node/genesis/builder/registry.go (P/X/C/D/Q/A/B/T/Z/G/K/I/O/R).
+// This nibble can only address 16 slots, so it enumerates the chains
+// that host C-nibble-routed precompiles plus the sovereign-L1 EVM
+// targets that reuse the C-Chain EVM precompile surface:
+//   C=0 → P-Chain   (platform)
+//   C=1 → X-Chain   (avm)
+//   C=2 → C-Chain   (evm, main EVM)
+//   C=3 → D-Chain   (dexvm — DEX/CLOB)
+//   C=4 → A-Chain   (aivm — AI / attestation)
+//   C=5 → B-Chain   (bridgevm — bridge)
+//   C=6 → Z-Chain   (zkvm — zk-rollup / privacy)
+//   C=7 → Q-Chain   (quantumvm — PQ consensus signing)
+//   C=8 → Zoo       (sovereign L1 EVM, white-label)
+//   C=9 → Hanzo     (sovereign L1 EVM, white-label)
+//   C=A → SPC       (sovereign L1 EVM, white-label)
+// T/G/K/I/O/R primary-network chains do not register C-nibble-routed
+// precompiles; they address by full chain ID, not by this nibble.
 //
 // Example: FROST on C-Chain = P=5 (Threshold), C=2 (C-Chain), II=00
 //          Address = 0x0000000000000000000000000000000000005200 (LP-5200)