Fix: validate AppQC/CommitQC index alignment

[wen-coding]

Summary

• Reject mismatched AppQC/CommitQC indices and surface errors.
• Propagate prune errors to avoid silent state corruption.
• Add regression tests for mismatched QC handling.
• Port of sei-v3 PR Bump lib version for rollback fixes #509.

Test Plan

• go test ./sei-tendermint/internal/autobahn/...

Made with Cursor

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 13, 2026, 5:24 PM

[codecov]

Codecov Report

❌ Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.17%. Comparing base (246e482) to head (ae3cfd9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/autobahn/avail/state.go	54.54%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2865      +/-   ##
==========================================
- Coverage   57.19%   57.17%   -0.02%     
==========================================
  Files        2091     2091              
  Lines      171514   171524      +10     
==========================================
- Hits        98089    98063      -26     
- Misses      64681    64706      +25     
- Partials     8744     8755      +11     

Flag	Coverage Δ
sei-chain	52.64% <68.75%> (-0.02%)	⬇️
sei-cosmos	48.16% <ø> (ø)
sei-db	68.72% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-tendermint/internal/autobahn/avail/inner.go	91.42% <100.00%> (+0.51%)	⬆️
sei-tendermint/internal/autobahn/avail/state.go	72.46% <54.54%> (-0.76%)	⬇️

... and 31 files with indirect coverage changes

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[pompon0]

I haven't previously paid attention to this test. Why are we corrupting the internal state here? Can we somehow create a realistic scenario instead?

[wen-coding]

That's a good point, my first time using Cursor and I found out AI can add unnecessary tests. This should be covered under QC verify, removing these tests.

[arajasek]

Seems reasonable to me!