evmrpc: derive *ExcludeTraceFail from receipt store, not block trace (CON-257)

[wen-coding]

Summary

isPanicOrSyntheticTx (used by sei_getTransactionReceiptExcludeTraceFail,
sei_traceBlockByHash/NumberExcludeTraceFail) previously re-traced the
receipt's block and decided panic/synthetic from trace.Error and
trace-list absence.

Under Autobahn, sei-tendermint's BlockResults stub
(sei-tendermint/internal/rpc/core/blocks.go:260) returns no TxsResults
— the per-tx ABCI responses aren't persisted. So the block trace returns
[] for any block, and every tx hash looks "synthetic" → every
*ExcludeTraceFail call returns ErrPanicTx.

This PR sources the same decision from the receipt store directly:

GetReceipt error                          → exclude (no trace anyway)
TxType == ShellEVMTxType (synthetic)      → exclude (no real EVM tx)
Status == 0 (failed receipt, post #3383)  → exclude (panic-like)
Status == 1                               → include

The receipt store is fully populated under Autobahn (off-tree pebble DB,
written via FlushTransientReceipts at PreCommit), so this works without
the deferred BlockResults.TxsResults follow-up.

Behavior

• Legacy / V2: equivalent. Status==0 and trace.Error != "" go
  hand-in-hand for receipts written through WriteReceipt (revert / OOG
  / EIP-7623 floor / etc.).
• Autobahn (Giga + OCC): takes
  sei_getTransactionReceiptExcludeTraceFail from broken to working.
• Side benefit: a single receipt-store lookup replaces a full block
  re-trace.

When BlockResults.TxsResults is eventually wired through Autobahn (likely
via Cody's litt block store), the trace-based path can come back as a
richer alternative, but this check doesn't need it.

Test plan

• make test-evm-rpc-io (docker localnet, Giga + OCC + Autobahn): 160/160 pass
  • Previously 159/160 — sei_getTransactionReceiptExcludeTraceFail was
    failing with code=-32000 message="transaction is panic tx" because
    the empty trace-list path treated every tx as synthetic.
• Same suite under Giga + OCC (no Autobahn): 160/160 pass — no regression
• gofmt -s -l clean
• go build ./... clean

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[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	May 6, 2026, 11:19 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.16%. Comparing base (8310d93) to head (1cc410f).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
evmrpc/tracers.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3402      +/-   ##
==========================================
+ Coverage   59.10%   59.16%   +0.06%     
==========================================
  Files        2101     2101              
  Lines      173195   173578     +383     
==========================================
+ Hits       102360   102699     +339     
- Misses      61955    61988      +33     
- Partials     8880     8891      +11     

Flag	Coverage Δ
sei-chain-pr	65.75% <0.00%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
evmrpc/tracers.go	72.28% <0.00%> (+4.36%)	⬆️

... and 3 files with indirect coverage changes

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