feat(evmrpc): align transaction errors with geth

[alexander-sei]

Describe your changes and provide context

Implements RFC 009 for eth_sendRawTransaction.

• adds a single RPC-boundary translation package for CheckTx, mempool, proxy, and timeout errors
• preserves native geth decode errors and already-typed remote JSON-RPC errors
• adds CheckTx-only diagnostic details and EIP-7623 floor-data-gas rejection without changing DeliverTx or historical trace behavior
• redacts proxy panic stacks and internal transport details from client responses
• maps EIP-7702 empty authorization lists and malformed signatures to geth-compatible errors
• adds structured IOX error assertions, signed rejection fixtures, differential checks, and a depguard ratchet
• documents intentional Sei/geth admission differences

Unknown internal submission failures now return -32603 internal error; known geth-compatible submission failures retain -32000, and request timeouts use -32002.

Testing performed to validate your change

• scripts/ramtest.sh ./evmrpc/... ./app/ante -run ... -count=1
• go test ./sei-tendermint/internal/proxy -run TestCheckTxSafe -count=1
• go test ./integration_test/evm_module/rpc_io_test -run TestParseIOFile_TestdataDir -count=1
• npx tsc --noEmit in integration_test/rpc_tests
• node --check contracts/test/lib.js
• node --check contracts/test/EVMCompatabilityTest.js
• make fmtcheck
• scoped golangci-lint over the changed Go packages
• git diff --check

The live Docker RPC integration suite was not run locally; keeping this PR in draft until that environment-backed gate runs.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Sep 7, 2026, 10:44 AM

[codecov]

Codecov Report

❌ Patch coverage is 78.40909% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.28%. Comparing base (abdcc45) to head (02e7602).

Files with missing lines	Patch %	Lines
app/ante/evm_checktx.go	51.72%	11 Missing and 3 partials ⚠️
integration_test/evm_module/rpc_io_test/io.go	48.14%	7 Missing and 7 partials ⚠️
evmrpc/send.go	76.92%	4 Missing and 2 partials ⚠️
evmrpc/ethrpcerrors/errors.go	95.60%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4102      +/-   ##
==========================================
- Coverage   61.21%   60.28%   -0.94%     
==========================================
  Files        2196     2088     -108     
  Lines      193395   180580   -12815     
==========================================
- Hits       118386   108854    -9532     
+ Misses      63793    61584    -2209     
+ Partials    11216    10142    -1074     

Flag	Coverage Δ
sei-chain-pr	70.96% <78.40%> (?)
sei-db	69.80% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/internal/proxy/proxy.go	89.39% <100.00%> (+0.33%)	⬆️
evmrpc/ethrpcerrors/errors.go	95.60% <95.60%> (ø)
evmrpc/send.go	62.41% <76.92%> (+9.21%)	⬆️
app/ante/evm_checktx.go	44.73% <51.72%> (+1.17%)	⬆️
integration_test/evm_module/rpc_io_test/io.go	72.45% <48.14%> (-2.19%)	⬇️

... and 112 files with indirect coverage changes

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