platformvm builds GREEN off the codec: executor fold + full consumer flip

vms/platformvm/... build + vet PASS with pcodecs/txs.Codec gone from the VM.

Executor semantics (standard_tx_executor):
- registerOwnSet(): shared primitive — per-validator state.L1Validator with
  native owner blobs (txs.MarshalOwner/UnmarshalOwner, no codec), active-set
  capacity check, EndAccumulatedFee=balance+accruedFees, SetNetToL1Conversion
  manager-authority recording (byte-for-byte legacy tail).
- ConvertNetworkTx: promote endomorphism (owner-authorized, folds old
  ConvertNetworkToL1Tx), gated by security.Mode.Manager.
- CreateNetworkTx: base (AddNet/SetNetOwner) + sovereign path registers own set.
- Deleted CreateSovereignL1Tx + ConvertNetworkToL1Tx.
- txs.UnmarshalOwner added: canonical owner marshal/unmarshal pair, no codec.

All ~13 txs.Visitor impls carry ConvertNetworkTx; gossip/block Parse(b) codec-free;
wallet/network/primary off txs.Codec.

KNOWN GAP (pending design decision, NOT silently green): CreateNetworkTx reads
tx.Chains() only to derive managerChainID — it does NOT create the genesis
chains (no AddChain). Atomic-spawn-with-chains vs decomplect-to-CreateChainTx is
the open call. 17 codec-era _test.go parked as .bak for follow-up rewrite.

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

go.mod

@@ -261,3 +261,5 @@ require (
 )
 
 exclude github.com/ethereum/go-ethereum v1.10.26
+
+replace github.com/luxfi/zap => /Users/z/work/lux/zap