Docs: clarify autobahn consensus vs avail roles

[wen-coding]

Summary

• Add comments clarifying the autobahn availability vs consensus responsibilities.
• Explain CommitQC sequencing between consensus and availability.
• Port of sei-v3 PR Increase pruning keep recent to keep 3 days of block data #508.

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[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 13, 2026, 4:26 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.17%. Comparing base (305d6f7) to head (4072e22).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2864       +/-   ##
===========================================
+ Coverage   48.35%   57.17%    +8.81%     
===========================================
  Files         671     2091     +1420     
  Lines       50615   171514   +120899     
===========================================
+ Hits        24474    98060    +73586     
- Misses      24000    64704    +40704     
- Partials     2141     8750     +6609     

Flag	Coverage Δ
sei-chain	52.64% <ø> (?)
sei-cosmos	48.15% <ø> (-0.02%)	⬇️
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/state.go	73.22% <ø> (ø)
...ei-tendermint/internal/autobahn/consensus/state.go	87.41% <ø> (ø)

... and 1542 files with indirect coverage changes

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