feat: Add --verbose and --debug CLI flags

- Add -v/--verbose flag (stackable: -v, -vv, -vvv) for increasing log verbosity
- Add --debug flag as shortcut for maximum verbosity (-vvv)
- Logs output to both stderr and strix_runs/{run_name}/debug.log when verbosity > 0
- At -vvv/--debug, enables litellm verbose mode for LLM debugging

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: yokoszn

strix/interface/main.py

@@ -313,6 +313,19 @@ def parse_arguments() -> argparse.Namespace:
         ),
     )
 
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        action="count",
+        default=0,
+        help="Increase verbosity (-v: WARNING, -vv: INFO, -vvv: DEBUG + litellm).",
+    )
+    parser.add_argument(
+        "--debug",
+        action="store_true",
+        help="Enable full debug output (equivalent to -vvv).",
+    )
+
     args = parser.parse_args()
 
     if args.instruction:
@@ -473,6 +486,24 @@ def main() -> None:
     if not args.run_name:
         args.run_name = generate_run_name(args.targets_info)
 
+    # Configure logging based on verbosity
+    verbosity = 3 if args.debug else args.verbose
+    log_level = [logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG][min(verbosity, 3)]
+    logging.basicConfig(
+        level=log_level,
+        format="%(asctime)s %(name)s %(levelname)s %(message)s",
+        handlers=[logging.StreamHandler()],
+    )
+    if verbosity > 0:
+        log_dir = Path("strix_runs") / args.run_name
+        log_dir.mkdir(parents=True, exist_ok=True)
+        fh = logging.FileHandler(log_dir / "debug.log")
+        fh.setLevel(log_level)
+        fh.setFormatter(logging.Formatter("%(asctime)s %(name)s %(levelname)s %(message)s"))
+        logging.getLogger().addHandler(fh)
+    if verbosity >= 3:
+        litellm.set_verbose = True
+
     for target_info in args.targets_info:
         if target_info["type"] == "repository":
             repo_url = target_info["details"]["target_repo"]