refactor(runtime)!: remove v2 processor service + fix latent eth numeric coercion

[philz3906]

Summary

Removes the V2 processor runtime (v4 only serves ProcessorV3) and migrates the SDK test framework onto ProcessorServiceImplV3. Doing so exposed a latent eth data bug that the V2 path had been masking, which is fixed here as well.

1. Remove V2 processor service (refactor(runtime)!)

• Delete ProcessorServiceImpl (service.ts) and its V2 tests (service.test.ts, seq-mode.test.ts).
• Drop FullProcessorServiceImpl and the V2 route registration in processor-runner.ts.
• Move recordRuntimeInfo + the BigInt.toJSON patch into utils.ts so service-v3 no longer imports from the deleted service.ts; re-point runtime index to service-v3.
• Migrate TestProcessorServer/MemoryDatabase onto ProcessorServiceImplV3, preserving the public processBindings/processBinding API by driving the V3 stream internally. Two behavior gaps vs. the old unary path are restored:
  • Direct store reads (service.store.get(...)): TestStoreContext.result now also calls super.result, so a request issued from the context itself is resolved instead of hanging.
  • Handler failures: reject when the result carries states.error (V3 reports errors as a result rather than erroring the stream).

2. Coerce numeric eth fields (fix(eth))

The lazy-getter refactor in #1411 dropped getNumber coercion on number-typed getters of FormattedLog/FormattedTransactionReceipt/FormattedTransactionResponse, so raw RPC hex strings (e.g. "0xf3") were returned for fields declared number. protobuf-es create() doesn't validate scalars, so it stayed latent — but ProcessorV3 clones/serializes the ProcessResult, and clone() throws FieldValueInvalidError on the int32 RecordMetaData fields these feed.

• Restore getNumber / allowNull(getNumber[, default]) on transactionIndex, logIndex, blockNumber, index, type, status, nonce (matching the pre-#1411 spec). tx.index is null-safe since pending/partial txs omit transactionIndex.
• Coerce trace.transactionPosition at the RecordMetaData boundary in context.ts, since traces are used as a raw cast with no Formatted wrapper.

Testing

• Full SDK test suite: passing (0 failures, 0 hangs).
• Runtime tests: 16/16.
• tsc (sdk + runtime) and ESLint clean.

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