refactor: address high-priority debt and publish to PyPI

- Fix TOCTOU race conditions by wrapping read-modify-write cycles
  under single-file locks in execution_state, portfolio_service,
  precheck_state, state_manager, and precheck_service.
- Add missing test coverage (96 tests total):
  - test_review_service.py (15 tests)
  - test_check_api.py (6 tests)
  - test_external_gate.py main branches (+10 tests)
  - test_trade_execution.py new commands (+8 tests)
- Unify all agent-consumed JSON messages to English.
- Config-ize hardcoded values (volume filter, schema_version) via
  get_user_config with sensible defaults.
- Add 1-hour TTL to exchange cache with force_new override.
- Add ruff and mypy to dev dependencies; fix all type errors.
- Add __all__ declarations to 11 service modules.
- Sync README with new commands, config tuning docs, and PyPI badge.
- Publish package as coinhunter==1.0.0 on PyPI with MIT license.
- Deprecate coinhunter-cli==1.0.1 with runtime warning.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/coinhunter/commands/review_engine.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""CLI adapter for review engine."""
+
+import json
+import sys
+
+from ..services.review_service import generate_review, save_review
+
+
+def main():
+    try:
+        hours = int(sys.argv[1]) if len(sys.argv) > 1 else 1
+        review = generate_review(hours)
+        path = save_review(review)
+        print(json.dumps({"ok": True, "saved_path": path, "review": review}, ensure_ascii=False, indent=2))
+    except Exception as e:
+        from ..logger import log_error
+        log_error("review_engine", e)
+        print(json.dumps({"ok": False, "error": str(e)}, ensure_ascii=False), file=sys.stderr)
+        raise SystemExit(1)
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())