refactor: move shims from templates/ to scripts/ and drop legacy shims

- Remove 4 legacy shim files; only the unified coinhunter_shim.py remains
- Move the remaining shim from templates/ to scripts/ per skill best practices
- Update all docs (README, CLAUDE, shim-templates) to reference scripts/

scripts/coinhunter_shim.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+"""Cross-platform cron shim: delegates any coinhunter subcommand via CLI."""
+import shutil
+import subprocess
+import sys
+
+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)
+
+if len(sys.argv) < 2:
+    print("usage: coinhunter_shim.py <subcommand> [args...]", file=sys.stderr)
+    print("example: coinhunter_shim.py pre", file=sys.stderr)
+    sys.exit(2)
+
+subcommand = sys.argv[1]
+args = sys.argv[2:]
+
+sys.exit(subprocess.run([BIN, subcommand, *args]).returncode)