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Juan Denis
a93697c7f6
Probe and report agent feature capabilities (cron, docker, systemd, nginx, etc.) so the panel can gate target pickers without extra round-trips. Key changes: - Add agent/internal/capabilities: probes host for features and platform/distro, returns protocol.CapabilitiesMessage cached at agent startup. - Agent: store probed capabilities, send them on every transport reconnect (sendCapabilities) and include them when using poll transport. - Protocol: introduce TypeCapabilities and CapabilitiesMessage (map[string]bool + platform/distro fields). - Poll transport: accept CapabilitiesMessage in Send(), serialize to raw payload and queue for next /poll; support one-shot capabilities in poll body. - Backend: handle capabilities from socket (on_capabilities) and poll endpoint; persist capabilities in in-memory ConnectedAgent (agent_registry) with helpers get_capabilities/has_capability; include capabilities/platform info in servers API. - New fleet API (GET /api/v1/fleet/targets): list runnable targets (local + connected agents) and optionally filter agents by a requested feature using the advertised capability map. Rationale: make agent feature availability explicit and discoverable to the panel so UI pickers can show only applicable agents without asking agents on every UI interaction.