chore: initial commit — unified project repo

Merged code repo (CompanionGuard-RL) into single project-level git.
Reorganized root: docs/, reference/, experiments/, tmp/active|archives/.
Gitignored: data/, checkpoints/, .venv, experiment logs, tmp/archives.

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

.gitignore

@@ -0,0 +1,44 @@
+# === 数据集（体积过大）===
+data/
+code/data/
+
+# === 模型权重 ===
+code/checkpoints/
+**/*.pt
+**/*.bin
+**/*.safetensors
+**/*.h5
+
+# === Python ===
+**/__pycache__/
+**/*.py[cod]
+**/*.egg-info/
+**/.pytest_cache/
+
+# === 虚拟环境 ===
+**/.venv*/
+**/venv/
+**/env/
+
+# === 历史压缩包 ===
+tmp/archives/
+sync_v*.tar.gz
+sync_v*.zip
+
+# === 大型实验日志 ===
+code/experiments/*.log
+
+# === 工具配置（用户本地）===
+.claude/
+.playwright-mcp/
+
+# === OS / 编辑器 ===
+.DS_Store
+Thumbs.db
+.idea/
+.vscode/
+*.swp
+
+# === 密钥 ===
+.env
+*.env