Scaffold SimpleX Orchestrate: supervisor over official binaries

A standalone control-plane app that spawns and drives the official SimpleX
binaries (never modifies simplex source). Validated against simplex-chat
built from source (stable v6.5.4, GHC 9.6.3).

- CLAUDE.md: architecture notes mined from the upstream docs (WebSocket bot API,
  per-profile DBs, directory/broadcast bot config)
- supervisor/: process registry + port allocation (supervisor.py), corrId/cmd<->resp
  WebSocket client (ws_client.py), binary locator (binaries.py), FastAPI front with
  REST control + /events stream (server.py)
- smoke_test.py: Pattern-1 handshake (spawn simplex-chat -p, create+read user) — PASS
- group_test.py: two accounts, invitation connect + group invite/join, verified
  membership over the real SMP network — PASS
- build_chat.sh / install_ghc.sh: reproducible toolchain + from-source build

Key finding: fresh DB prompts for a display name on stdin; spawn with
--create-bot-display-name to start the WebSocket server non-interactively.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

build_chat.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+export PATH="$HOME/.ghcup/bin:$PATH"
+cd /home/user/code/simplex-orchestrate/simplex-chat
+echo "=== toolchain ==="; ghc --version; cabal --version
+echo "=== cabal update ==="; cabal update
+echo "=== building exe:simplex-chat (long) ==="
+cabal build exe:simplex-chat
+BIN="$(cabal list-bin exe:simplex-chat)"
+echo "=== built: $BIN ==="
+cp "$BIN" /home/user/code/simplex-orchestrate/bin/simplex-chat
+chmod +x /home/user/code/simplex-orchestrate/bin/simplex-chat
+/home/user/code/simplex-orchestrate/bin/simplex-chat --help >/dev/null 2>&1 && echo "binary runs OK"
+echo "=== BUILD COMPLETE ==="