refactor: move README/CLAUDE to root; rewrite CLAUDE.md as project constitution

- git mv code/README.md → README.md (project-level)
- Rewrite CLAUDE.md: accurate Module C status (v5 pending),
  Red Lines table (6 rules from real incidents), file map,
  server quick-reference, updated SCP commands
- Merge code/.gitignore into root .gitignore (dist/, build/,
  wandb/, *.jsonl, *.json.gz); delete code/.gitignore
- code/ now contains only: src/ scripts/ configs/ tests/
  checkpoints/ data/ requirements.txt

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

.gitignore

@@ -14,6 +14,9 @@ code/checkpoints/
 **/*.py[cod]
 **/*.egg-info/
 **/.pytest_cache/
+dist/
+build/
+.eggs/
 
 # === 虚拟环境 ===
 **/.venv*/
@@ -25,8 +28,11 @@ tmp/archives/
 sync_v*.tar.gz
 sync_v*.zip
 
-# === 大型实验日志 ===
+# === 大型数据 / 实验日志 ===
 experiments/*.log
+**/*.jsonl
+**/*.json.gz
+wandb/
 
 # === 旧方向归档 ===
 旧方向信息/