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/__init__.py

@@ -4,15 +4,18 @@ Tool implementations for agent use.
 All tools inherit from BaseTool and return ToolResult.
 """
 from src.domains.tools.base import BaseTool, ToolResult
-from src.domains.tools.file import ReadFileTool, GlobFilesTool
+from src.domains.tools.file import ReadFileTool, GlobFilesTool, EditFileTool, WriteFileTool
 from src.domains.tools.search import GrepContentTool
-from src.domains.tools.shell import BashReadOnlyTool
+from src.domains.tools.shell import BashReadOnlyTool, BashTool
 
 __all__ = [
     "BaseTool",
     "ToolResult",
     "ReadFileTool",
     "GlobFilesTool",
+    "EditFileTool",
+    "WriteFileTool",
     "GrepContentTool",
     "BashReadOnlyTool",
+    "BashTool",
 ]