fix: replace all non-ASCII progress markers for Windows encoding

Also fix miner.py checkmark and box-drawing/arrow chars (─, →) in
both miner.py and split_mega_files.py that would crash on cp1251/cp1252.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mempalace/miner.py

@@ -602,7 +602,7 @@ def process_file(
     chunks = chunk_text(content, source_file)
 
     if dry_run:
-        print(f"    [DRY RUN] {filepath.name} → room:{room} ({len(chunks)} drawers)")
+        print(f"    [DRY RUN] {filepath.name} -> room:{room} ({len(chunks)} drawers)")
         return len(chunks), room
 
     # Lock this file so concurrent agents don't interleave delete+insert.
@@ -779,7 +779,7 @@ def mine(
         print("  .gitignore: DISABLED")
     if include_ignored:
         print(f"  Include: {', '.join(sorted(normalize_include_paths(include_ignored)))}")
-    print(f"{'─' * 55}\n")
+    print(f"{'-' * 55}\n")
 
     if not dry_run:
         collection = get_collection(palace_path)
@@ -809,7 +809,7 @@ def mine(
             total_drawers += drawers
             room_counts[room] += 1
             if not dry_run:
-                print(f"  ✓ [{i:4}/{len(files)}] {filepath.name[:50]:50} +{drawers}")
+                print(f"  + [{i:4}/{len(files)}] {filepath.name[:50]:50} +{drawers}")
 
     print(f"\n{'=' * 55}")
     print("  Done.")

mempalace/split_mega_files.py

@@ -290,7 +290,7 @@ def main():
     print(f"  Source:      {src_dir}")
     print(f"  Output:      {output_dir or 'same dir as source'}")
     print(f"  Mega-files:  {len(mega_files)}")
-    print(f"{'─' * 60}\n")
+    print(f"{'-' * 60}\n")
 
     total_written = 0
     for f, n_sessions in mega_files:
@@ -301,11 +301,11 @@ def main():
         if not args.dry_run and written:
             backup = f.with_suffix(".mega_backup")
             f.rename(backup)
-            print(f"  → Original renamed to {backup.name}\n")
+            print(f"  -> Original renamed to {backup.name}\n")
         else:
             print()
 
-    print(f"{'─' * 60}")
+    print(f"{'-' * 60}")
     if args.dry_run:
         print(f"  DRY RUN — would create {total_written} files from {len(mega_files)} mega-files")
     else: