feat: AVM cutover — delete NAPI AVM, wire IPC simulator pool + CDB IPC server [PR 3b]

[charlielye]

Summary

Cuts the simulator from the in-process NAPI AVM to the standalone aztec-avm service introduced in #23084. Contract data callbacks are served by the TS-hosted CdbIpcServer, and world-state access goes through the generated wsdb package/service from the lower stack.

This is the top PR in the current IPC stack.

Stack

1. feat(ipc): add /ipc-codegen and /ipc-runtime foundation packages #23610 cl/ipc-foundation
2. refactor(wsdb): migrate aztec-wsdb to ipc-codegen + ipc-runtime #23611 cl/ipc-wsdb-migrate
3. refactor(bbapi): migrate bb binary to ipc-codegen + ipc-runtime #23612 cl/ipc-bb-migrate
4. refactor(barretenberg-rs): migrate to ipc-codegen + ipc-runtime; drop PipeBackend #23613 cl/ipc-bb-rs-migrate
5. refactor(bb.js): migrate to ipc-codegen + ipc-runtime; delete legacy bb::ipc #23614 cl/ipc-bb-js-migrate
6. refactor: cut TS world state and NAPI AVM over to WSDB IPC; delete NAPI WSDB #23036 cl/ipc-3-avm-wsdb-cutover
7. feat: add aztec-avm + aztec-cdb binaries and IPC supporting code (inert) #23084 cl/ipc-4-avm-binary
8. feat: AVM cutover — delete NAPI AVM, wire IPC simulator pool + CDB IPC server [PR 3b] #23697 cl/ipc-5-avm-cutover — this PR

What changes

Deletes NAPI AVM

• Deletes barretenberg/cpp/src/barretenberg/nodejs_module/avm_simulate/.
• Removes AVM simulation exports from nodejs_module / @aztec/native.
• Leaves nodejs_module focused on the remaining native pieces that still belong there.

Rewires simulator and node/prover paths

• CppPublicTxSimulator drives an AvmIpcBackend backed by AvmSimulatorPool.
• AvmSimulatorPool owns AvmBackend instances and uses explicit async disposal.
• CdbIpcServer serves contract data to standalone aztec-avm.
• aztec-node, validator, prover-node, and TXE startup paths create and clean up wsdb/avm/cdb resources explicitly.
• Tests that own proving/simulator fixtures now close those resources instead of relying on process exit.

Cleanup and test alignment

• Replaces cpp_vs_ts_public_tx_simulator with ipc_vs_ts_public_tx_simulator.
• Removes tests that only covered the old in-process AVM/world-state race.
• Keeps generated CDB/AVM client usage aligned with the lower codegen changes.

Validation

• yarn-project/yarn install --immutable passed on lower cutover branch after generated package lock updates.
• Root ./bootstrap.sh passed on this branch during stack validation.
• Follow-up CI should exercise the full top-of-stack e2e surface: block building, AVM simulator, prover-node, validator, TXE.