test: Yiren/fkv mig int rebase v2

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[cursor]

PR Summary

High Risk
Changes state-commit migration routing, AppHash/double-flush semantics, and coordinated multi-validator flips; incorrect behavior could fork consensus or halt blocks after migration.

Overview
Adds FlatKV EVM v0→v1 (memiavl_only → migrate_evm) integration coverage: docker clusters can boot via GIGA_MIGRATE_FROM_MEMIAVL, coordinated stop/flip/restart helpers (lib/flatkv_migration.sh), bulk EVM fixture storage, and seidb migrate-evm-status for polling completion. CI enables FlatKV EVM Migrate, Migrate Idle, and Migrate Negative; many rows stay commented until post-migration EVM store iteration is fixed (EndBlock RemoveFirstNTxHashes vs RouterCommitKVStore after cutover).

State-commit / migration behavior changes include configurable sc-keys-to-migrate-per-block, composite once-per-block migration forwarding (AppHash double-flush), migration manager routing for new keys and memiavl iterators during in-flight migrate, FlatKV seeded snapshot on SetInitialVersion, and expanded unit/rootmulti/composite tests. evm_stress -mode contract-storage supports live-workload scripts (mostly parked in CI).

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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 26, 2026, 3:10 PM

[codecov]

Codecov Report

❌ Patch coverage is 60.90535% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.08%. Comparing base (3ebdc40) to head (6b88c30).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...b/tools/cmd/seidb/operations/migrate_evm_status.go	0.00%	48 Missing ⚠️
scripts/evm_stress/main.go	0.00%	28 Missing ⚠️
sei-db/state_db/sc/migration/migration_manager.go	91.30%	3 Missing and 3 partials ⚠️
sei-db/state_db/sc/migration/migration_metrics.go	92.59%	4 Missing and 2 partials ⚠️
app/seidb.go	0.00%	2 Missing and 1 partial ⚠️
sei-db/state_db/sc/flatkv/store_meta.go	33.33%	1 Missing and 1 partial ⚠️
sei-db/tools/cmd/seidb/main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3503      +/-   ##
==========================================
- Coverage   59.11%   59.08%   -0.04%     
==========================================
  Files        2187     2188       +1     
  Lines      182236   182393     +157     
==========================================
+ Hits       107724   107761      +37     
- Misses      64864    64981     +117     
- Partials     9648     9651       +3     

Flag	Coverage Δ
sei-chain-pr	57.86% <60.90%> (?)
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
sei-db/state_db/sc/composite/store.go	73.47% <100.00%> (+1.55%)	⬆️
sei-db/state_db/sc/flatkv/verify.go	48.71% <ø> (ø)
sei-db/state_db/sc/migration/router_builder.go	56.72% <100.00%> (+0.42%)	⬆️
sei-db/state_db/sc/flatkv/store_meta.go	67.96% <33.33%> (-0.84%)	⬇️
sei-db/tools/cmd/seidb/main.go	0.00% <0.00%> (ø)
app/seidb.go	73.61% <0.00%> (-3.21%)	⬇️
sei-db/state_db/sc/migration/migration_manager.go	94.52% <91.30%> (-2.00%)	⬇️
sei-db/state_db/sc/migration/migration_metrics.go	83.52% <92.59%> (+4.95%)	⬆️
scripts/evm_stress/main.go	0.00% <0.00%> (ø)
...b/tools/cmd/seidb/operations/migrate_evm_status.go	0.00% <0.00%> (ø)

... and 29 files with indirect coverage changes

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[chatgpt-codex-connector]

Reject invalid sc-keys-to-migrate-per-block values

When state-commit.sc-keys-to-migrate-per-block is present but non-positive (or non-numeric, which cast.ToInt turns into 0), this code silently ignores the user-provided value and keeps the default 1024 instead of surfacing a config error. That makes bad configs look successful and can materially change migration behavior (for example, operators/tests expecting a tiny batch size will actually run at 1024 keys/block). Since StateCommitConfig.Validate() already defines <= 0 as invalid, swallowing the value here bypasses that validation signal and hides misconfiguration.

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