refactor: split precheck_core and migrate commands to commands/

- Split 900-line precheck_core.py into 9 focused modules:
  precheck_constants, time_utils, data_utils, state_manager,
  market_data, candidate_scoring, snapshot_builder,
  adaptive_profile, trigger_analyzer
- Remove dead auto_trader command and module
- Migrate 7 root-level command modules into commands/:
  check_api, doctor, external_gate, init_user_state,
  market_probe, paths, rotate_external_gate_log
- Keep thin backward-compatible facades in root package
- Update cli.py MODULE_MAP to route through commands/
- Verified compileall and smoke tests for all key commands

src/coinhunter/rotate_external_gate_log.py

@@ -1,28 +1,8 @@
-#!/usr/bin/env python3
-"""Rotate external gate log using the user's logrotate config/state."""
-import shutil
-import subprocess
+"""Backward-compatible facade for rotate_external_gate_log."""
 
-from .runtime import ensure_runtime_dirs, get_runtime_paths
-
-PATHS = get_runtime_paths()
-STATE_DIR = PATHS.state_dir
-LOGROTATE_STATUS = PATHS.logrotate_status
-LOGROTATE_CONF = PATHS.logrotate_config
-LOGS_DIR = PATHS.logs_dir
-
-
-def main():
-    ensure_runtime_dirs(PATHS)
-    logrotate_bin = shutil.which("logrotate") or "/usr/sbin/logrotate"
-    cmd = [logrotate_bin, "-s", str(LOGROTATE_STATUS), str(LOGROTATE_CONF)]
-    result = subprocess.run(cmd, capture_output=True, text=True)
-    if result.stdout.strip():
-        print(result.stdout.strip())
-    if result.stderr.strip():
-        print(result.stderr.strip())
-    return result.returncode
+from __future__ import annotations
 
+from .commands.rotate_external_gate_log import main
 
 if __name__ == "__main__":
     raise SystemExit(main())