Add script detection, env shebang parser, and opt-in content guessing

src/rp/cli.py

@@ -65,6 +65,13 @@ def main(
             help="Use pager for output. Default: auto-detect.",
         ),
     ] = None,
+    guess_content: Annotated[
+        bool,
+        typer.Option(
+            "--guess-content/--no-guess-content",
+            help="Use heuristic content-based type detection as a fallback.",
+        ),
+    ] = False,
     version: Annotated[
         bool | None,
         typer.Option(
@@ -84,6 +91,7 @@ def main(
         theme: Pygments color theme.
         line_numbers: Show line numbers. Default: auto.
         pager: Use pager for output. Default: auto-detect.
+        guess_content: Use heuristic content-based type detection as a fallback.
         version: Show version and exit.
     """
     console = Console()
@@ -114,7 +122,12 @@ def main(
         console.print("[dim]Empty input, nothing to display.[/dim]")
         raise typer.Exit()
 
-    file_type = detect_type(path=file_path, content=content, explicit_type=file_type)
+    file_type = detect_type(
+        path=file_path,
+        content=content,
+        explicit_type=file_type,
+        guess_content=guess_content,
+    )
 
     options = RenderOptions(
         theme=theme,