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/cli.py

@@ -9,18 +9,17 @@ import sys
 from . import __version__
 
 MODULE_MAP = {
-    "check-api": "check_api",
-    "doctor": "doctor",
-    "external-gate": "external_gate",
-    "init": "init_user_state",
-    "market-probe": "market_probe",
-    "paths": "paths",
+    "check-api": "commands.check_api",
+    "doctor": "commands.doctor",
+    "external-gate": "commands.external_gate",
+    "init": "commands.init_user_state",
+    "market-probe": "commands.market_probe",
+    "paths": "commands.paths",
     "precheck": "commands.precheck",
     "review-context": "review_context",
     "review-engine": "review_engine",
-    "rotate-external-gate-log": "rotate_external_gate_log",
+    "rotate-external-gate-log": "commands.rotate_external_gate_log",
     "smart-executor": "commands.smart_executor",
-    "auto-trader": "auto_trader",
 }
 
 ALIASES = {
@@ -47,7 +46,6 @@ COMMAND_HELP = [
     ("recap", "review-engine", "Generate review recap/engine output"),
     ("rotate-gate-log, rotate-log", "rotate-external-gate-log", "Rotate external gate logs"),
     ("exec", "smart-executor", "Trading and execution actions"),
-    ("auto-trader", None, "Auto trader entrypoint"),
 ]