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>

code/.gitignore

@@ -0,0 +1,43 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+dist/
+build/
+.eggs/
+
+# Virtual environments
+.venv/
+venv/
+env/
+
+# Data (raw and processed — do not commit large datasets)
+data/raw/
+data/processed/
+
+# Model checkpoints
+checkpoints/
+
+# Experiment outputs
+experiments/eval_results.json
+wandb/
+
+# Editor
+.idea/
+.vscode/
+*.swp
+
+# OS
+.DS_Store
+Thumbs.db
+
+# API keys
+.env
+*.env
+
+# Large model / data files (anywhere in tree)
+*.pt
+*.bin
+*.jsonl
+*.json.gz
+*.h5
+*.safetensors