…ctor (L2 on top of #21516)

Lifts the typed-vio refactor (AddressEntry struct with per-AccountPath
typed fields, generic WriteCell[T], typed VersionedRead/Write[T], typed
PerPath ReadSet/WriteSet on IBS, per-T sync.Pool) onto current main on top
of the L1 profiling instrumentation merged as #21516.

Replaces the untyped any-boxed WriteCell/ReadSet shape across:
- execution/state/versionmap.go: VersionMap.s now map[Address]*AddressEntry
  with typed btree.Map[int, *WriteCell[T]] per AccountPath
- execution/state/versionedio.go: typed VersionedRead[T] / VersionedWrite[T]
  primitives + per-T pools; AnyVersionedWrite interface for collections
- execution/state/intra_block_state.go: typed PerPath{Read,Write}Set fields
  on IBS + recordVR/recordVW helpers
- execution/state/state_object.go, journal.go, rw_v3.go, read_paths.go (new):
  consumers updated to typed shape
- execution/stagedsync/exec3_*.go, committer.go, calc_state.go,
  exec3_filter.go: VersionedWrites consumers migrated to AnyVersionedWrite
  iteration; commitment touch path uses VersionedWrites.TouchUpdates over
  the typed shape
- execution/exec/block_assembler.go, txtask.go: PerPathReadSet/WriteSet
  threading
- execution/types/accounts/code.go (new): canonical accounts.Code value
  type used by CodePath WriteCell[T]

Shims used to isolate from the non-vio refactors landed on
mh/perf-all-followups that vio is NOT structurally dependent on:

- execution/cache/state_cache.go: PutCode(hash, code) pass-through (no
  weak-pointer code-cache landing required)
- execution/commitment/vio_shims.go: no-op Record{Sstore*, HasStorageMiss}
  counters (commitment-metrics landing not required)
- common/dbg: BAL{DrivenCommitment, ShadowCompute} stubbed false
  (BAL-driven commitment landing not required)
- execution/balcache: stub package with CachedBlockAccessList returning
  no-cached (BAL cache landing not required)
- db/state/aggregator_vio_shim.go: SetMaxCollationTxNum no-op
- execution/state/prewarm_shim.go: PrewarmBlockStateCacheFromBAL no-op
- execution/state/access_set_shim.go: AccessSet type +
  IBS.AccessedAddresses returning nil (access tracking folded into
  ReadSet under typed vio; api-compat shim for txtask + block_assembler)
- execution/state/vio_test_shim.go: VersionedIO.RecordAccesses no-op
  used only by execution/tests/blockgen chain_makers.go
- types.CodeChange.Hash literal stripped (typed-CodeChange landing not
  required; main's CodeChange has only Index+Bytecode)
- mdgas.MdGas refund flattened back to uint64 across IBS/journal/
  state_object (multi-dim gas landing not required)
- Tracing reasons restored on IBS.SetNonce/SetCode +
  stateObject.SetNonce/SetCode signatures (main has them; chain-end
  dropped them — restored so main's evm/vm/aura/bor call sites work)
- TouchPlainKeyDirect call sites in versionedio.go and calc_state.go
  rewritten to main's untyped (string, *Update) signature
  (typed-commitment-handle landing not required)
- Hash.Bytes() → Hash[:] across stagedsync (no Hash.Bytes method on main)
- td declared *uint256.Int to match main's chainReader.GetTd return type

Foundation for tip-perf alloc reduction in the parallel-exec hot path
(versionedRead[T] CPU + WriteSet.Set/ReadSet.Set allocs). Builds clean
end-to-end; lint and on-tip characterisation follow.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>