test(celestia-node-fiber): in-process Upload/Listen/Download showcase

[walldiss]

Summary

Follow-up to #3279. Adds `tools/celestia-node-fiber/testing/`, a self-contained end-to-end showcase that boots a single-validator Celestia chain, an in-process Fibre server, a celestia-node bridge, and drives the merged adapter through Upload → Listen → Download.

The test suite was developed alongside the adapter PR but pushed after #3279 had already been merged, so it never made it into julien/fiber. This PR lands it.

What it covers

• `testing/network.go` — testnode boot, in-process `appfibre.Server` with memory store, valaddr registration (using the `dns:///` URI scheme the gRPC resolver requires), escrow funding via `MsgDepositToEscrow`.
• `testing/bridge.go` — in-process celestia-node bridge with JWT auth (`ws://` endpoint, since `Blob.Subscribe` is a channel-returning method and go-jsonrpc only supports streaming methods over WebSocket).
• `testing/showcase_test.go` — `TestShowcase`: subscribe first, upload a blob, wait for the share-version-2 BlobEvent after the async `MsgPayForFibre` commits, assert the returned BlobID matches what Listen emitted, Download and diff the payload.

Observations surfaced by the test

Two non-obvious gotchas are embedded in the helpers and documented in comments so any future integrator does not re-learn them:

1. FSP host must be registered with `dns:///` prefix — the Fibre client's gRPC dialer treats a bare `host:port` as a URL, failing on the colon. Matches how `tools/talis/fibre_setup.go` provisions real networks.
2. `BridgeDAAddr` must use `ws://` — HTTP-only JSON-RPC rejects `blob.Subscribe` with `method '...' not supported in this mode (no out channel support)`.

Scope boundaries

• Single-validator (`testnode.NewNetwork` is hardcoded single-val). This is the "fast sanity test" layer — the slow-path 2-validator variant is planned as a separate Docker Compose follow-up that can exercise real 2/3 quorum collection.
• Build-tagged `fibre`; excluded from default test runs (no change to default CI).

Test plan

• `go mod tidy` — no drift vs. latest julien/fiber
• `go build -tags fibre ./...`
• `go vet -tags fibre ./...` — clean
• `go test -tags fibre -count=1 -run TestShowcase ./testing/...` — passes in ~7 seconds on a warm cache
• Full module test (`go test -tags fibre ./...`) — 8 tests pass (7 adapter unit + 1 showcase)
• Adapter tests still pass without `-tags fibre` — showcase is build-gated

One-liner to run it

```
go test -tags fibre -count=1 -timeout 5m -run TestShowcase ./tools/celestia-node-fiber/testing/...
```

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