INT-711 Queue splitting - NATS Pub Sub support

[vladrbg]

No description provided.

[greptile-apps]

Greptile Summary

This PR expands the queue-splitting documentation from NATS JetStream to include Core NATS Pub/Sub.

• Adds Core NATS routing, configuration, filtering, and best-effort delivery guidance.
• Adds NATS Pub/Sub to the feature matrix and shared queue-filter reference.
• Renames the navigation entry from “NATS JetStream” to “NATS.”

Important Files Changed

Filename	Overview
docs/sharing-the-cluster/queue-splitting/nats.md	Adds Core NATS Pub/Sub setup and routing guidance, but omits minimum compatible Operator and CLI versions.
docs/sharing-the-cluster/queue-splitting.md	Extends the shared queue type, message-filter, jq-filter, and session-key documentation for NATS Pub/Sub.
docs/reference/feature-matrix.md	Adds an Alpha support row for Core NATS Pub/Sub.
docs/SUMMARY.md	Broadens the existing navigation label from NATS JetStream to NATS.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  P[Original NATS subject] --> O[mirrord Operator]
  O -->|filter matches| S[Session-prefixed subject]
  O -->|no filter matches| W[Workload fallback subject]
  S --> L[Local application]
  W --> D[Deployed workload]

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### Issue 1
docs/sharing-the-cluster/queue-splitting/nats.md:311
**Missing compatibility version requirements**

The new `operator.natsPubsubSplitting`, `kind: natsPubSub`, and `queue_type: NATSPubSub` identifiers are documented without the minimum compatible Operator and CLI versions. Users with older installations cannot determine compatibility from this guide and can encounter an ignored Helm value or an unrecognized configuration variant.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "fix" | Re-trigger Greptile}

[skreborn]

The queueType list in status.md doesn't include NATSPubSub. NATS and BullMQ appear to be missing, as well. In the same file, the resolved-name list doesn't contain subject.

[skreborn]

Note that this isn't properly linked to INT-711.

[linear-code]

INT-711