When BTerminal is launched from a Claude Code terminal, ~8 CLAUDE*
env vars leak into the sidecar child processes. The claude CLI detects
these as nesting indicators and silently hangs. Previously only
CLAUDECODE was removed; now all CLAUDE-prefixed vars are stripped
in both Node.js and Deno sidecar runners.
Experimental agent-runner-deno.ts as drop-in replacement for Node.js sidecar.
Uses Deno.Command for claude CLI subprocess, TextLineStream for NDJSON parsing.
Same stdio NDJSON protocol. Compiles to single binary via deno compile.
Not yet integrated with Rust SidecarManager.
Replace Agent SDK stub with working implementation that spawns
claude CLI with --output-format stream-json, manages multiple
sessions via Map<sessionId, ChildProcess>, and forwards NDJSON
events to Rust backend. Supports query, stop, and graceful shutdown.
