feat: SOVD entity model alignment and multi-instance peer aggregation#327

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bburda wants to merge 39 commits intomainfrom

feat/entity-model-and-aggregation

Commits on Mar 31, 2026

feat(discovery): add HostInfoProvider for default Component from host system
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feat(discovery): map namespaces to Functions instead of Areas/Components
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feat(discovery): wire HostInfoProvider as default Component in runtime_only mode
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test: update integration tests for SOVD-aligned entity model
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feat(aggregation): add resource collections on Function/Area entities (x-medkit extension)
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feat(aggregation): add PeerClient and extend EntityInfo with remote fields
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feat(aggregation): add EntityMerger with type-aware merge logic
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feat(aggregation): add AggregationManager with routing, fan-out, health monitoring
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feat(aggregation): add StreamProxy abstraction with SSE implementation
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feat(aggregation): add MdnsDiscovery with configurable announce/discover
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fix: remove unused includes and variables in stream_proxy and mdns_discovery
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feat(aggregation): wire HandlerContext forwarding and GatewayNode integration
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feat(aggregation): add global fan-out for faults and peer status in health
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docs: add aggregation design doc, config reference, and multi-instance tutorial
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test: add integration tests for entity model and peer aggregation
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fix: area logs fall through to prefix matching when no components linked
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fix: thread safety, response limits, and header filtering in aggregation
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fix: mDNS self-discovery filter, URL validation, socket logging, and entity limits
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docs: fix stale config examples, entity model descriptions, and cross-references
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test: add mock server tests for PeerClient, SSE streaming, and mDNS callbacks
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fix: body size limits, loopback blocking, lock patterns, and stale docs
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fix: strip peer prefix from forwarded paths and validate static peer URLs
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fix: move mdns.h to vendored dir (unformatted) and fix copyright headers
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fix: PlantUML syntax errors in aggregation design doc
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fix: remove parentheses and block skinparams from PlantUML diagrams
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fix: PlantUML compat with older version - remove actor from class diagram, packageStyle
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fix: correct mDNS query response record order per RFC 6763 (PTR answer, SRV additional)
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fix: case-insensitive mDNS service name matching per RFC 1035
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fix: add diagnostic logging to mDNS announce and browse loops
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fix: use hostname for mDNS instance name instead of ROS node name
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fix: document mdns_name parameter, fix tutorial mDNS examples, add instance_name tests
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fix: unmanifested_nodes ignore policy now hides orphan apps and their synthetic components
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refactor: remove synthetic/heuristic Area and Component creation per #325
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fix: component merge by ID, function hosts from cache, and remote component lookup
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fix: handle_get_area cache-first lookup, update merge docs for Component merge-by-ID
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fix: apply cache-first lookup to all remaining discovery detail handlers
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fix: parse parent_component_id, depends_on, and hosts from peer entity responses
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test: verify fetch_entities parses relationship fields from peer responses
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fix: fetch entity details from peers for complete relationship data
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