feat(pipelines): add watermark f12 2000px resize pipeline

Resize to 2000px max edge then apply F12 watermark darktable style.

Co-authored-by: Cursor <cursoragent@cursor.com>

pipelines/pipeline_watermark_f12_2000px.py

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+#!/usr/bin/env python3
+"""Resize to 2000px max edge, then colorsplash + F12 watermark darktable style."""
+
+from pathlib import Path
+
+from imagepipeline import Pipeline
+
+INPUT = Path(
+    "/home/frank/pics/20260712_Aichelberg Indians - Heidelberg Hedgehogs/darktable_exported/edits"
+)
+OUTPUT_BASE = Path.home() / "pipeline_output"
+
+MAX_EDGE = 2000
+STYLE = "Watermark F12.rocks"
+
+
+def main() -> None:
+    with Pipeline(
+        name="watermark_f12_2000px",
+        input_dir=INPUT,
+        output_base=OUTPUT_BASE,
+    ) as p:
+        resized = p.step("imagemagick_resize", inputs="input", max_edge=MAX_EDGE)
+        p.step("darktable_style", inputs=resized, style=STYLE)
+        output_root = p.run()
+
+    print(f"Pipeline finished. Output: {output_root}")
+
+
+if __name__ == "__main__":
+    main()