feat(tools): celestia-node-backed Fibre DA adapter

[walldiss]

Summary

Adds `tools/celestia-node-fiber`, a new Go sub-module implementing the `fiber.DA` interface (`block/internal/da/fiber.DA`, re-exported as `block.FiberClient`) on top of a celestia-node `api/client.Client`.

• Upload — `client.Fibre.Upload`. Off-chain row upload + validator sig aggregation + background `MsgPayForFibre` broadcast. Runs directly against consensus gRPC + FSPs using the self-sufficient client from celestia-node #4961. No bridge hop.
• Download — `client.Fibre.Download`. Reads reconstructed blobs directly from FSPs. No bridge hop.
• Listen — `client.Blob.Subscribe` on a bridge node, filtered to share-version-2 blobs. Per ADR-013 those are the on-chain reflection of `MsgPayForFibre` settlements, so only Fibre-settled blobs reach consumers. BlobEvent is reconstructed from `Blob.FibreBlobVersion()` + `Blob.FibreCommitment()`.

Design notes

• Separate sub-module. Lives at `tools/celestia-node-fiber/` with its own `go.mod` (mirrors `tools/local-fiber/` isolation). celestia-node's replace soup (celestia-core, cosmos-sdk forks, boxo, etc.) stays out of ev-node core. Parent module is pulled in via a local `replace github.com/evstack/ev-node => ../../.`.
• Constructors.
  • `New(ctx, cfg, kr)` — builds the underlying `api/client.Client` and owns its lifecycle; must be `Close()`d.
  • `FromModules(fibre, blob, listenChannelSize)` — accepts the `fibreapi.Module` and `blobapi.Module` interfaces directly so callers can inject mocks or reuse a pre-built client.
• Namespace format. Adapter expects the 10-byte v0 ID (matches `datypes.NamespaceFromString` output). Wraps into `libshare.NewV0Namespace`; length mismatch surfaces a clear error.
• ExpiresAt. Hardcoded to `now + 24h` with a TODO. Matches the placeholder used by `tools/local-fiber`. Real retention will come once celestia-node exposes it from `x/fibre` params.
• Listen filter. Share-version-0/1 blobs that share the namespace (plain PFB) are dropped. A future adapter can opt-in to a mixed view if needed.

What this does not change

• `tools/local-fiber/` stays as-is.
• `block/internal/da/fiber` types and `block/public.go` Fiber re-exports are untouched.
• No changes to sequencer / submitter / DA retry logic.

Follow-ups out of scope

• celestia-node's `fibre.Service.Upload` currently uses the sync `SubmitMessage` path in its background goroutine (still blocks the goroutine until chain inclusion). The design conversation with @vgonkivs flagged this as a temp solution pending `QueuedTxClient`; that follow-up is already tracked on celestia-node and does not block this adapter.
• Integration testing against a live fibre network is intentionally not included — it requires running FSPs and an x/fibre-enabled chain, which don't exist in the ev-node test harness today.

Test plan

• `go build ./...` in `tools/celestia-node-fiber/`
• `go vet ./...` in `tools/celestia-node-fiber/` — clean
• `go test -count=1 ./...` — 7 tests, all pass
  • `TestAdapterSatisfiesDA` — compile-time DA interface assertion
  • `TestUpload_ForwardsNamespaceDataAndBlobID`
  • `TestUpload_RejectsWrongNamespaceLength`
  • `TestUpload_PropagatesFibreError`
  • `TestDownload_ReturnsResultData`
  • `TestListen_FiltersFibreOnlyAndEmitsEvent` — exercises filter + BlobID reconstruction
  • `TestListen_CancelledContextClosesOutput`

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[julienrbrt]

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