feat(core): typed batch references grouped by protocol category

[Agash]

Acts on the batch DX review, plus the LOGGEN036 warnings that appeared once Microsoft.Extensions.Resilience pulled in the stricter logging generator.

Typed references

Each batch request now hands back a reference carrying its response type, and requests are reached through the protocol's own categories:

ObsBatchBuilder batch = new();
BatchRef<GetVersionResponseData> version = batch.General.GetVersion();
BatchRef<GetSceneListResponseData> scenes = batch.Scenes.GetSceneList(new());

BatchResults results = await client.CallBatchAsync(batch, cancellationToken: ct);

Console.WriteLine(results.Get(version).ObsVersion);

Neither the position nor the response type is restated at the call site, and a request type can appear many times in one batch with each reference still resolving to its own result.

The categories are OBS's own category field from protocol.json, not invented here, so they track the protocol on refresh: canvases, config, filters, general, inputs, media inputs, outputs, record, scene items, scenes, sources, stream, transitions, ui.

This replaces the chainable positional methods rather than adding to them. Capturing a reference takes a statement per request anyway, so the generated method count stays at 147 rather than doubling.

Also

• TryGet reports a failed or missing result without throwing; reading a reference past a haltOnFailure truncation throws with a message saying why.
• Add gains a JsonTypeInfo<T> overload so custom payloads stay AOT-safe.
• LOGGEN036 fixed by typing all 76 generated log parameters. No suppression.

Verified

• Solution builds with 0 errors and 0 warnings on net9.0/net10.0/net11.0.
• 23 batch tests covering reference identity, duplicates, ordering, truncation, both transports, and the absent-payload shape.
• run-transport-tests passes on JSON and MessagePack against OBS 32.2.2, including a batch that repeats one request type three times with two different payloads and reads each back through its own reference.