fix(ci, windows): track bundle_deps.py and improve mingw dynamic library resolution

.gitignore

@@ -3,4 +3,5 @@
 scratch/
 *.orig
 *.obOCNTS
-*.py
+/*.py
+!packaging/**/*.py

packaging/windows/bundle_deps.py

@@ -0,0 +1,117 @@
+#!/usr/bin/env python3
+import os
+import sys
+import glob
+import shutil
+import subprocess
+
+def main():
+    bundle_dir = sys.argv[1] if len(sys.argv) > 1 else "dist/bundle"
+    if not os.path.exists(bundle_dir):
+        print(f"Error: Bundle directory '{bundle_dir}' not found.")
+        sys.exit(1)
+
+    print(f"Resolving dynamic Windows dependencies for {bundle_dir}...")
+    
+    # 1. Locate MinGW bin directory containing FFmpeg DLLs
+    candidate_dirs = [
+        os.path.dirname(os.path.abspath(sys.executable)),
+        "/mingw64/bin",
+        "C:/msys64/mingw64/bin",
+        "D:/msys64/mingw64/bin",
+    ]
+    mingw_bin = None
+    for cand in candidate_dirs:
+        if os.path.isdir(cand) and glob.glob(os.path.join(cand, "avcodec-*.dll")):
+            mingw_bin = cand
+            break
+
+    if not mingw_bin:
+        for cand in candidate_dirs:
+            if os.path.isdir(cand):
+                mingw_bin = cand
+                break
+
+    if not mingw_bin:
+        mingw_bin = "/mingw64/bin"
+
+    print(f"Using MinGW bin directory: {mingw_bin}")
+
+    patterns = [
+        "avcodec-*.dll",
+        "avformat-*.dll",
+        "avutil-*.dll",
+        "swresample-*.dll",
+        "swscale-*.dll",
+        "avfilter-*.dll",
+        "avdevice-*.dll",
+        "libwinpthread-*.dll",
+        "libgcc_s_seh-*.dll",
+        "libstdc++-*.dll",
+        "zlib*.dll",
+    ]
+
+    for pat in patterns:
+        for match in glob.glob(os.path.join(mingw_bin, pat)):
+            dest = os.path.join(bundle_dir, os.path.basename(match))
+            if not os.path.exists(dest):
+                shutil.copy2(match, dest)
+                print(f"Explicitly copied: {os.path.basename(match)}")
+
+    # 2. Recursive dependency discovery via ldd
+    def get_ldd_deps(filepath):
+        deps = []
+        try:
+            out = subprocess.check_output(["ldd", filepath], text=True, stderr=subprocess.DEVNULL)
+            for line in out.splitlines():
+                line = line.strip()
+                if "mingw64/bin" in line.lower():
+                    tokens = line.split()
+                    for token in tokens:
+                        if "mingw64/bin" in token.lower() and token.lower().endswith(".dll"):
+                            if os.path.exists(token):
+                                deps.append(token)
+                            elif mingw_bin and os.path.exists(os.path.join(mingw_bin, os.path.basename(token))):
+                                deps.append(os.path.join(mingw_bin, os.path.basename(token)))
+        except Exception:
+            pass
+        return deps
+
+    visited = set()
+    added_count = 0
+
+    while True:
+        candidates = [
+            os.path.join(bundle_dir, f)
+            for f in os.listdir(bundle_dir)
+            if (f.lower().endswith(".exe") or f.lower().endswith(".dll")) and f not in visited
+        ]
+        if not candidates:
+            break
+
+        new_found = False
+        for c in candidates:
+            visited.add(os.path.basename(c))
+            for dep in get_ldd_deps(c):
+                dll_name = os.path.basename(dep)
+                dest = os.path.join(bundle_dir, dll_name)
+                if not os.path.exists(dest):
+                    shutil.copy2(dep, dest)
+                    added_count += 1
+                    new_found = True
+                    print(f"Discovered dependency: {dll_name} (from {os.path.basename(c)})")
+
+        if not new_found:
+            break
+
+    # 3. Validation
+    all_files = os.listdir(bundle_dir)
+    has_avcodec = any("avcodec" in f.lower() for f in all_files)
+    if not has_avcodec:
+        print("ERROR: avcodec-*.dll was NOT found in bundle directory!")
+        sys.exit(1)
+
+    print(f"Successfully assembled bundle in '{bundle_dir}' with {len(all_files)} total files.")
+
+if __name__ == "__main__":
+    main()