feat: add Shell and Git execution hands for Timmy (#136)

src/infrastructure/hands/__init__.py

@@ -0,0 +1,17 @@
+"""Hands — local execution capabilities for Timmy.
+
+Unlike OpenFang (vendored binary sidecar), these hands run in-process
+and provide direct shell and git execution with sandboxing and approval
+gates.
+
+Usage:
+    from infrastructure.hands import shell_hand, git_hand
+
+    result = await shell_hand.run("make test")
+    result = await git_hand.run("status")
+"""
+
+from infrastructure.hands.shell import shell_hand
+from infrastructure.hands.git import git_hand
+
+__all__ = ["shell_hand", "git_hand"]