refactor: decouple Coin Hunter from Hermes for cross-platform usage

- Add unified coinhunter_shim.py that accepts subcommands (pre/gate/review/rotate-log)
- Update SKILL.md gate pseudocode to read optional ~/.coinhunter/platform.json
- Split cron/setup examples into Hermes and OpenClaw variants across docs
- Introduce platform.json schema in user-data-layout.md
- Remove stale auto_trader.py/run_trader.sh references from auto-trading-guide.md
- Keep legacy shims as backward-compatible wrappers

templates/coinhunter_precheck_shim.py

@@ -1,10 +1,12 @@
 #!/usr/bin/env python3
-"""Compatibility shim for Hermes cron script hook.
-Real logic lives in the CoinHunter skill.
-Copy this file to ~/.hermes/scripts/coinhunter_precheck.py if needed.
-"""
-import runpy
-from pathlib import Path
+"""Hermes cron shim: runs coinhunter precheck via CLI."""
+import shutil
+import subprocess
+import sys
 
-TARGET = Path.home() / ".hermes" / "skills" / "coinhunter" / "scripts" / "coinhunter_precheck.py"
-runpy.run_path(str(TARGET), run_name="__main__")
+BIN = shutil.which("coinhunter") or shutil.which("coinhunter.exe")
+if not BIN:
+    print("error: coinhunter CLI not found in PATH. Install with: pipx install coinhunter", file=sys.stderr)
+    sys.exit(127)
+
+sys.exit(subprocess.run([BIN, "pre", *sys.argv[1:]]).returncode)