Add adapter version to LLO bridge telemetry

[denis-chernov-smartcontract]

Summary

External-adapter (streams-adapter) version is now discovered from the adapter's
health endpoint and stamped into the meta.adapterVersion field of each live
bridge observation's telemetry copy, alongside a TTL bump for cached
observations.

Changes

Adapter version discovery (bridgeconn)

• BridgeConnManager gains an AdapterVersion(bridge) (string) method that
  returns the version the bridge's streams-adapter last reported, or "" if it
  is not yet known. It never creates a connection.
• eaConn now tracks the adapter version behind a dedicated versionMu, plus a
  healthURL and healthClient used for discovery.
• On every successful stream (re)connect, eaConn asynchronously fetches
  GET <bridge URL>/health (adapterHealthURL, bounded by the new
  adapterHealthTimeout = 1s) and records the response's adapterVersion
  field via fetchAdapterVersion. Failures are best-effort: they log at debug
  and leave the previous value in place, never affecting the stream.
• adapterHealthURL derives the health endpoint from the bridge URL, preserving
  scheme/authority and stripping query/fragment.

Version field in telemetry (task.bridge.go)

• Live (non-cache-hit) bridge responses are stamped with the adapter version in
  the telemetry copy only, via the new adapterMetaForTelemetry helper. The
  byte slice is cloned before jsonparser.Set so the untouched body remains the
  task result, and the value persisted to the bridge cache.
• Cache-fallback bodies are left unstamped (they were produced by an earlier
  adapter build), consistent with local_cache_hit marking those rows.

Observation cache TTL

• observationTTL increased from 60s to 90s (bridge_conn_manager.go) to match the JS adapter behaviour.

Testing

• TestAdapterHealthURL — health endpoint derivation from bridge URLs.
• TestEAConn_RefreshAdapterVersion — version discovery behavior across HTTP
  statuses, missing/malformed fields, and disabled clients.
• TestBridgeConnManager_AdapterVersion — bridge-name prefix normalization and
  unknown-bridge handling.
• TestAdapterMetaForTelemetry — version stamping edge cases (empty version,
  non-object body, escaping, input non-mutation).
• Reworked TestBridgeTask_UsesBridgeConnManagerCacheFallback to exercise the
  live-observation and cache-fallback telemetry paths.

[github-actions]

✅ No conflicts with other open PRs targeting develop

[trunk-io]

   

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[cl-sonarqube-production]

Quality Gate passed

Issues
2 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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