chore: fix .gitignore encoding (UTF-16 -> ASCII) and untrack .claude/

The .gitignore was UTF-16-encoded, so git parsed line 1 as a bare "*"
(ignore everything) and the ".claude/" rule never applied — every other
worktree got swept into `git add .` as embedded repos. Rewrite it as
plain ASCII (*.png, .claude/, __pycache__/) and stop tracking the
.claude/ worktree gitlinks + settings.local.json that had been
accidentally committed earlier (files kept on disk).

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

.claude/settings.local.json

@@ -1,40 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(ls 'D:\\\\USTH\\\\KLTN\\\\data'*.py)",
-      "Bash(grep -E '__init__|\\\\.py$')",
-      "Bash(python -c \"import json; nb = json.load\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\scripts\\\\kaggle_train.ipynb', encoding='utf-8'\\)\\); print\\('cells:', len\\(nb['cells']\\)\\); print\\('types:', [c['cell_type'] for c in nb['cells']]\\)\")",
-      "Read(//d D:/USTH/**)",
-      "Bash(python -c \"import ast; ast.parse\\(open\\('training/train.py'\\).read\\(\\)\\); ast.parse\\(open\\('evaluation/evaluate.py'\\).read\\(\\)\\); ast.parse\\(open\\('utils/hf_uploader.py'\\).read\\(\\)\\); print\\('all syntactically valid'\\)\")",
-      "WebSearch",
-      "WebFetch(domain:github.com)",
-      "WebFetch(domain:openi.nlm.nih.gov)",
-      "Bash(python scripts/_convert_to_ipynb.py)",
-      "Bash(python -c \"import json; nb=json.load\\(open\\('scripts/kaggle_train.ipynb',encoding='utf-8'\\)\\); print\\('cells:', len\\(nb['cells']\\)\\); print\\('types:', [c['cell_type'] for c in nb['cells']][:5]\\); print\\('first cell source[:3]:', nb['cells'][0]['source'][:3]\\)\")",
-      "Bash(python -c \"import json; nb=json.load\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\scripts\\\\kaggle_train.ipynb',encoding='utf-8'\\)\\); [print\\(i, c.get\\('metadata',{}\\).get\\('id','?'\\), '|', ''.join\\(c.get\\('source',[]\\)\\)[:80].replace\\(chr\\(10\\),' '\\)\\) for i,c in enumerate\\(nb['cells']\\)]\")",
-      "Bash(python -c \"import json,io,sys; sys.stdout=io.TextIOWrapper\\(sys.stdout.buffer,encoding='utf-8'\\); nb=json.load\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\scripts\\\\kaggle_train.ipynb',encoding='utf-8'\\)\\); [print\\(i, c.get\\('metadata',{}\\).get\\('id','?'\\)\\) for i,c in enumerate\\(nb['cells']\\)]\")",
-      "Bash(python -c 'import json,io,sys; sys.stdout=io.TextIOWrapper\\(sys.stdout.buffer,encoding='\\\\''utf-8'\\\\''\\); nb=json.load\\(open\\(r'\\\\''D:\\\\USTH\\\\KLTN\\\\scripts\\\\kaggle_train.ipynb'\\\\'',encoding='\\\\''utf-8'\\\\''\\)\\); *)",
-      "Bash(python)",
-      "Bash(python -c \"import ast; ast.parse\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\training\\\\train.py',encoding='utf-8'\\).read\\(\\)\\); print\\('train.py ok'\\)\")",
-      "Bash(python -c \"import ast; ast.parse\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\evaluation\\\\evaluate.py',encoding='utf-8'\\).read\\(\\)\\); print\\('evaluate.py ok'\\)\")",
-      "Bash(python -c \"from omegaconf import OmegaConf; cfg=OmegaConf.load\\(r'D:\\\\USTH\\\\KLTN\\\\configs\\\\train_config.yaml'\\); print\\('yaml ok, save_steps=', cfg.training.save_steps, 'limit=', cfg.training.save_total_limit\\)\")",
-      "Bash(python -c \"import json; nb=json.load\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\scripts\\\\kaggle_train.ipynb',encoding='utf-8'\\)\\); print\\('ipynb cells=', len\\(nb['cells']\\)\\)\")",
-      "Bash(python -c \"import yaml; cfg=yaml.safe_load\\(open\\(r'D:\\\\USTH\\\\KLTN\\\\configs\\\\train_config.yaml',encoding='utf-8'\\)\\); print\\('save_steps=', cfg['training']['save_steps'], 'limit=', cfg['training']['save_total_limit'], 'upload_interm=', cfg['training']['upload_intermediate_to_hf']\\)\")",
-      "Bash(python D:\\\\USTH\\\\KLTN\\\\cxr-vlm-code\\\\_tmp_edit_notebook.py)",
-      "Bash(npm list *)",
-      "Bash(mkdir -p \"C:/Users/admin/AppData/Roaming/npm\")",
-      "Bash(npm install *)",
-      "Bash(npm root *)",
-      "Bash(NODE_PATH=\"C:/Users/admin/AppData/Roaming/npm/node_modules\" node bao_cao_tien_do.js)",
-      "Bash(python -c ' *)",
-      "Bash(python generate_pipeline_svg.py)",
-      "Bash(python -c \"from PIL import Image; print\\('pil ok'\\)\")",
-      "Bash(where magick *)",
-      "Bash(where inkscape *)",
-      "Bash(python -c \"import cairosvg; cairosvg.svg2png\\(url='pipeline_diagram.svg', write_to='pipeline_diagram.png', output_width=2800\\)\")",
-      "Bash(python scripts/_patch_notebook.py)",
-      "Bash(python scripts/_patch_notebook2.py)",
-      "Bash(python scripts/_verify_nb.py)"
-    ]
-  }
-}

.claude/worktrees/keen-galileo-ce978c

@@ -1 +0,0 @@
-Subproject commit 28b13fcded5614d6ab4088a8d8f6a20b87060306

.claude/worktrees/nice-kapitsa-0be5ac

@@ -1 +0,0 @@
-Subproject commit 28b13fcded5614d6ab4088a8d8f6a20b87060306

.claude/worktrees/strange-agnesi-73641a

@@ -1 +0,0 @@
-Subproject commit 9dadb472ab6ab5dee7a656bf525b249a605a68ff