Restructure as Codex plugin

skills/last30days/scripts/lib/log.py

@@ -0,0 +1,28 @@
+"""Shared logging utilities for last30days skill."""
+
+import os
+import sys
+
+DEBUG = os.environ.get("LAST30DAYS_DEBUG", "").lower() in ("1", "true", "yes")
+
+
+def debug(msg: str) -> None:
+    """Log debug message to stderr (only when LAST30DAYS_DEBUG is set)."""
+    if DEBUG:
+        sys.stderr.write(f"[DEBUG] {msg}\n")
+        sys.stderr.flush()
+
+
+def source_log(prefix: str, msg: str, *, tty_only: bool = True) -> None:
+    """Log a source module message to stderr.
+
+    Args:
+        prefix: Source label (e.g. "Reddit", "Bird").
+        msg: Message text.
+        tty_only: If True, only log when stderr is a TTY (avoids cluttering
+                  non-interactive output like Claude Code).
+    """
+    if tty_only and not sys.stderr.isatty():
+        return
+    sys.stderr.write(f"[{prefix}] {msg}\n")
+    sys.stderr.flush()