AgentSight analysis extension

This extension contains the existing post-capture AgentSight pipeline: protocol analyzers, materialized views, agent/session correlation, SQLite/OTel sinks, and local-session projection.

The native agentsight-capture-core crate owns only the stable capture boundary (Event, EventStream, Runner, Analyzer) and platform collectors. Analysis code lives here so it can be composed and migrated to WebAssembly Components without changing eBPF or /proc capture. The published agentsight-capture compatibility facade preserves the combined API for existing downstream users.