candor-agents v0.20.1

0.20.1 engine patch (spec stays 0.20) — grew the curated TELEMETRY_HOSTS set from a real-repo dogfood of 0.20: adds posthog.com, plausible.io, usefathom.com, heapanalytics.com, fullstory.com, hotjar.com, logrocket.com, cloudflareinsights.com (single-purpose analytics / session-replay / RUM). These now classify known-telemetry, so deny Net[unknown-host] tolerates them instead of false-flagging. Shared verbatim four-way; no vocabulary/schema change.