node: purge 'snowman' comment references — Quasar/Nova terminology (comment-only, no behavior change)

Removes the forbidden Avalanche term from code comments in chains/manager.go,
chains/quorum.go, and vms/proposervm/proposer/windower_determinism_test.go. Reworded to
preserve exact meaning; comments only, no identifier/behavior change.

Co-authored-by: Hanzo Dev <dev@hanzo.ai>

chains/manager.go

@@ -1162,7 +1162,7 @@ func (m *manager) buildChain(chainParams ChainParameters, sb nets.Net) (*chainIn
 		vmConfigBytes := m.injectAutominingConfig(chainParams.VMID, chainConfig.Config)
 		vmConfigBytes = m.injectSecurityProfileConfig(chainParams.VMID, vmConfigBytes)
 		// CONSENSUS-SAFETY (single-proposer-per-height): re-wrap multi-validator
-		// linear chains in proposervm so block production follows the Snowman++
+		// linear chains in proposervm so block production follows the proposervm's
 		// proposer schedule — exactly ONE validator builds height H, the rest wait
 		// and vote. Without it every validator's engine calls BuildBlock
 		// UNCONDITIONALLY at every height off a slightly-different mempool, so two
@@ -1207,7 +1207,7 @@ func (m *manager) buildChain(chainParams ChainParameters, sb nets.Net) (*chainIn
 		// enabling it can never weaken safety — at worst it halts (never forks).
 		if consensusParams.K > 1 && strings.EqualFold(os.Getenv("LUX_CONSENSUS_VIEW_CHANGE"), "true") {
 			consensusParams.ViewChange = true
-			// NOTE: presetK/presetAlpha are the Snowman SAMPLE preset (MainnetParams K=21/α=15),
+			// NOTE: presetK/presetAlpha are the sample preset (MainnetParams K=21/α=15),
 			// NOT the finality committee. The α-of-K cert and the view-change POL/precommit are
 			// sized to the LIVE validator set at runtime via effectiveCommittee/bftCommittee
 			// (e.g. 5 validators → K=5/α=4); the engine logs the effective (K,α) whenever it
@@ -1524,7 +1524,7 @@ func (m *manager) buildChain(chainParams ChainParameters, sb nets.Net) (*chainIn
 			// the proposervm, whose SignedBlock carries the real P-chain height
 			// (selectChildPChainHeight = max(GetCurrentHeight, parentH)) and exposes
 			// PChainHeight() — the SAME value the engine's pChainHeightOf reads. That
-			// is precisely the Snowman++ mechanism newPChainHeightVM was a stand-in
+			// is precisely the proposervm mechanism newPChainHeightVM was a stand-in
 			// for, so stacking both would double-stamp the height. We keep
 			// newPChainHeightVM only for the unwrapped K>1 chains (P-Chain, X-Chain).
 			if blockBuilder != nil && !wrapInProposerVM {

chains/quorum.go

@@ -89,7 +89,7 @@ func selectConsensusParams(sybilProtection bool, networkID uint32) consensusconf
 
 // shouldWrapInProposerVM decides whether a linear chain.ChainVM is wrapped in
 // proposervm to enforce single-proposer-per-height block production (the
-// Snowman++ window). It is the SINGLE policy gate (the manager calls it once);
+// proposer window). It is the SINGLE policy gate (the manager calls it once);
 // keeping it a pure function makes the policy unit-testable without standing up
 // a whole chain. All three conditions must hold:
 //
@@ -270,7 +270,7 @@ func (s *validatorStakeSource) TotalStake(height uint64) uint64 {
 // ValidatorCount implements consensuschain.StakeSource. The number of DISTINCT
 // validators in the set IN FORCE AT height — the round-scoped view-change's BFT
 // committee size (it sizes its POL/precommit quorum to bftAlpha over this count,
-// NOT the oversized Snowman sample K). Read from the SAME height-indexed set as
+// NOT the oversized sample K). Read from the SAME height-indexed set as
 // Weight/TotalStake so every node computes the identical committee and the
 // count-quorum matches the ⅔-by-stake set exactly.
 func (s *validatorStakeSource) ValidatorCount(height uint64) int {

vms/proposervm/proposer/windower_determinism_test.go

@@ -18,7 +18,7 @@
 //   - ROTATION (liveness): consecutive slots designate (in general) DIFFERENT
 //     proposers, so a down/wedged/forked designated proposer for slot S is routed
 //     around: at slot S+1 (5s later) a different validator is designated and builds
-//     a signed block the rest accept. This is avalanchego's Snowman++ mechanism,
+//     a signed block the rest accept. This is the upstream proposer-window mechanism,
 //     byte-for-byte (windower.go is identical to ava's), and the reason a faulty
 //     leader cannot halt the chain.
 //