[Live2D] Add editing, linting, batch ops, and workflow commands (v0.3.0) (#313)

* [Live2D] Add LIVE2D.md

* [Live2D] Add setup.py

* [Live2D] Add CHANGELOG.md

* [Live2D] Add cli_anything/live2d/__init__.py

* [Live2D] Add cli_anything/live2d/__main__.py

* [Live2D] Add cli_anything/live2d/live2d_cli.py

* [Live2D] Add cli_anything/live2d/skills/SKILL.md

* [Live2D] Add cli_anything/live2d/core/__init__.py

* [Live2D] Add cli_anything/live2d/core/parser.py

* [Live2D] Add cli_anything/live2d/core/validator.py

* [Live2D] Add cli_anything/live2d/core/scanner.py

* [Live2D] Add cli_anything/live2d/core/motion_parser.py

* [Live2D] Add cli_anything/live2d/core/expression_parser.py

* [Live2D] Add cli_anything/live2d/core/texture_info.py

* [Live2D] Add cli_anything/live2d/core/physics_parser.py

* [Live2D] Add cli_anything/live2d/core/moc3_parser.py

* [Live2D] Add cli_anything/live2d/core/comparer.py

* [Live2D] Add cli_anything/live2d/core/dependency.py

* [Live2D] Add cli_anything/live2d/core/packager.py

* [Live2D] Add cli_anything/live2d/core/template.py

* [Live2D] Add cli_anything/live2d/core/yoyo_pipeline.py

* [Live2D] Add cli_anything/live2d/core/backup.py

* [Live2D] Add cli_anything/live2d/core/linter.py

* [Live2D] Add cli_anything/live2d/core/differ.py

* [Live2D] Add cli_anything/live2d/core/snapshot.py

* [Live2D] Add cli_anything/live2d/tests/__init__.py

* [Live2D] Add cli_anything/live2d/tests/test_core.py

* [Live2D] Add tests/__init__.py

* [Live2D] Add tests/test_validator.py

* [Live2D] Add tests/test_yoyo_pipeline.py

* [Live2D] Add tests/test_new_features.py

* [Live2D] Fix: preserve motion extra fields (Sound etc.), moc3 check strict-only

* [Live2D] Fix: preserve motion extra fields (Sound etc.), moc3 check strict-only

* [Live2D] Fix: preserve motion extra fields (Sound etc.), moc3 check strict-only

* [Live2D] Fix test: non-strict validate passes with placeholder moc3

* [Live2D] Fix: yoyo case-insensitive idle, flatten collision detection, pack missing optional deps

* [Live2D] Fix: yoyo case-insensitive idle, flatten collision detection, pack missing optional deps

* [Live2D] Fix: runtime-check JSON exit code, physics Vertices key

* [Live2D] Fix: runtime-check JSON exit code, physics Vertices key

* feat(live2d): add repo integration - gitignore, registry, root skill

- Add !/live2d/ allowlist in .gitignore (Steps 4/5/6)
- Add cli-anything-live2d entry to registry.json
- Add skills/cli-anything-live2d/SKILL.md for root skill discovery

* fix: address Codex review - flatten JSON output, pack Sound files, texture error handling

1. flatten: run actual flatten before emitting JSON output (--json is output mode, not dry-run)
2. pack: include motion Sound files in package zip
3. texture_info: catch Pillow UnidentifiedImageError for corrupt textures, fall back to header parsing

* fix: finish Live2D v0.3.0 blockers

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Co-authored-by: tron <zhangyazhou@yinshantech.cn>
Co-authored-by: yuhao <itsyuhao@icloud.com>