feat: add coding tools (edit_file, write_file, bash)

New tools for code modification:
- EditFileTool: find-and-replace with safety checks (unique match required)
- WriteFileTool: create/overwrite files with path validation
- BashTool: full bash with controlled write access

Security controls on BashTool:
- Allowed: mkdir, touch, cp, mv, rm (single files), git, pip, pytest
- Forbidden: sudo, curl, wget, ssh, rm -rf, chmod 777

Includes 39 new tests (78 total now passing).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

webber-api/src/domains/tools/shell/__init__.py

@@ -2,5 +2,6 @@
 Shell execution tools.
 """
 from src.domains.tools.shell.bash import BashReadOnlyTool
+from src.domains.tools.shell.bash_full import BashTool
 
-__all__ = ["BashReadOnlyTool"]
+__all__ = ["BashReadOnlyTool", "BashTool"]