feat(autobahn): Add epoch.Registry to maintain committee/stake (CON-358)

[wen-coding]

Summary

• Introduces epoch.Registry which consolidates firstBlock and genesisTimestamp — genesis config that doesn't change across epochs — alongside the committee
• Bakes firstBlock into Proposal so GlobalRange() returns absolute block numbers directly, removing it as a call-site parameter throughout the stack. The proto message is now self-contained on the wire, making it much easier to interpret during emergency debugging. Also fixes a reproposal bug where TimeoutQC.reproposal() was double-counting firstBlock
• All consumers (consensus, avail, data) now route committee lookups through registry.CommitteeFor(roadIndex). The registry currently returns the genesis committee for all RoadIndexes — we wire the read side first so that any bug introduced when implementing dynamic epochs in follow-up PRs is immediately visible at the call sites rather than requiring a cascading refactor to find it

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Wide refactor of consensus verification, global numbering, and wire decoding (required global_first), plus avail quorum logic—behavior should match genesis-fixed committee today but mistakes would affect safety and sync.

Overview
Adds epoch.Registry as the shared source for firstBlock, genesis timestamp, and committee lookup by road index (CommitteeFor, EpochWindow, VerifyInWindow), replacing a bare *types.Committee in data, consensus, and avail (including tests and block DB sim helpers).

Committee is slimmed to validator weights only; firstBlock / genesis time move to ViewSpec.FirstBlock, NewProposal, and FullProposal.Verify(..., genesisTimestamp). CommitQC / Proposal.GlobalRange() no longer take a committee—the absolute range is stored on the proposal and on the wire as required global_first in autobahn.proto.

Avail initializes lanes across the epoch window, resolves lane QCs per epoch (votes weighted per committee in blockVotes), and WaitForLaneQCs takes an epoch index. Prune/load paths use the anchor’s committee and registry.FirstBlock().

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 25, 2026, 12:47 AM

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 24, 2026, 2:30 AM

[codecov]

Codecov Report

❌ Patch coverage is 83.38558% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.16%. Comparing base (c528303) to head (09e677e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/autobahn/avail/state.go	72.72%	6 Missing and 6 partials ⚠️
sei-tendermint/internal/autobahn/data/state.go	72.97%	1 Missing and 9 partials ⚠️
...dermint/internal/autobahn/pb/autobahn.wireguard.go	40.00%	6 Missing ⚠️
sei-tendermint/internal/autobahn/epoch/registry.go	83.87%	4 Missing and 1 partial ⚠️
...ei-tendermint/internal/autobahn/consensus/inner.go	33.33%	0 Missing and 4 partials ⚠️
...-tendermint/internal/autobahn/avail/block_votes.go	85.71%	2 Missing and 1 partial ⚠️
sei-tendermint/internal/autobahn/avail/inner.go	89.65%	1 Missing and 2 partials ⚠️
...ei-tendermint/internal/autobahn/consensus/state.go	81.25%	0 Missing and 3 partials ⚠️
sei-tendermint/autobahn/types/commit_qc.go	50.00%	0 Missing and 2 partials ⚠️
sei-db/ledger_db/block/blocksim/blocksim.go	50.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3632      +/-   ##
==========================================
- Coverage   59.12%   58.16%   -0.96%     
==========================================
  Files        2259     2178      -81     
  Lines      186489   176961    -9528     
==========================================
- Hits       110255   102931    -7324     
+ Misses      66353    64936    -1417     
+ Partials     9881     9094     -787     

Flag	Coverage Δ
sei-chain-pr	75.53% <83.38%> (?)
sei-db	70.41% <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-db/ledger_db/block/blocksim/block_generator.go	81.25% <100.00%> (+0.60%)	⬆️
sei-tendermint/autobahn/types/committee.go	98.48% <100.00%> (-0.09%)	⬇️
sei-tendermint/autobahn/types/opt.go	100.00% <ø> (ø)
sei-tendermint/autobahn/types/testonly.go	94.52% <100.00%> (+0.53%)	⬆️
sei-tendermint/autobahn/types/timeout.go	82.31% <100.00%> (-0.59%)	⬇️
...ternal/autobahn/consensus/persist/fullcommitqcs.go	78.75% <100.00%> (ø)
...nternal/autobahn/consensus/persist/globalblocks.go	77.77% <100.00%> (ø)
sei-tendermint/internal/autobahn/data/testonly.go	50.00% <100.00%> (-11.33%)	⬇️
sei-tendermint/internal/autobahn/epoch/testonly.go	100.00% <100.00%> (ø)
...i-tendermint/internal/p2p/giga/pb/api.wireguard.go	100.00% <100.00%> (ø)
... and 15 more

... and 83 files with indirect coverage changes

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