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The Go methods cross the native bridge and therefore return an error; Rust,
Node.js, and Python expose these in-process observation getters synchronously.
Streaming returns versioned AgentEvent envelopes. version, type,
payload, and optional metadata are the stable lossless fields; text, tool
names, tool output, errors, token totals, and verification summaries are
convenience projections. Unknown future type values and their payloads remain
available to hosts.