feat(da): support fiber (not via c-node)

[julienrbrt]

Overview

Support Fiber client (based on https://github.com/celestiaorg/celestia-app/blob/63fbf31cca216fc4e067a9e1b3a3431115c7009b/fibre), but not via celestia node or apex for this PoC
celestiaorg/celestia-node#4892

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[github-actions]

The latest Buf updates on your PR. Results from workflow CI / buf-check (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	✅ passed	✅ passed	Apr 14, 2026, 3:06 PM

[claude]

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[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 30 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@2865d6d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
block/public.go	0.00%	12 Missing ⚠️
block/internal/da/fiber_client.go	95.60%	7 Missing and 4 partials ⚠️
pkg/sequencers/solo/sequencer.go	61.53%	5 Missing ⚠️
pkg/config/config.go	75.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3244   +/-   ##
=======================================
  Coverage        ?   62.91%           
=======================================
  Files           ?      123           
  Lines           ?    13152           
  Branches        ?        0           
=======================================
  Hits            ?     8275           
  Misses          ?     3992           
  Partials        ?      885           

Flag	Coverage Δ
combined	62.91% <89.65%> (?)

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