feat: auto-generate metadata markdown for each panorama

Includes: coverage, FOV, camera specs, photogrammetry reference,
equirectangular projection info, timing, image list.

Also: docker-compose user fix (1000:100) to avoid root-owned files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pipeline/panorama_pipeline.py

@@ -19,6 +19,7 @@ import cv2
 import glob
 import math
 import mysql.connector
+from panorama_metadata import generate_metadata
 import numpy as np
 import os
 import re
@@ -515,6 +516,19 @@ def run_pipeline(work_dir, clahe_images, original_images, azs, els,
     if os.path.exists(out_tif):
         os.remove(out_tif)
 
+    # Generate metadata file
+    try:
+        generate_metadata(
+            work_dir=work_dir, output_name=output_name,
+            sol=int(re.search(r'\d+', output_name).group()),
+            camera=camera or "unknown", rover="perseverance",
+            azs=azs, els=els, img_w=img_w, img_h=img_h, fov=fov,
+            n_cps=len(cp_lines), timings=timings,
+            original_images=original_images, blender=blender,
+            output_png=out_png)
+    except Exception as e:
+        print(f"  Warning: metadata generation failed: {e}")
+
     return out_png, timings