Add TDD-style failing tests that verify the built-in git-checkout resource
type is available after initialization. Tests assert the correct expected
behavior: after agents init, the git-checkout type should exist in the
registry and 'agents resource add git-checkout' should succeed.

Tests are expected to fail until bug #524 is fixed, because
bootstrap_builtin_types() is never called during initialization. The fix
branch should be based on this branch so the fix commit inherits these tests.

Files added:
- features/resource_type_bootstrap_git.feature (2 Behave scenarios)
- features/steps/resource_type_bootstrap_git_steps.py (step definitions)
- robot/resource_type_bootstrap_git.robot (Robot Framework smoke test)

ISSUES CLOSED: #553

@@ -0,0 +8,4 @@
+
+  # ── Registry presence after bootstrap ──────────────────────
+
+  Scenario: After initialization the git-checkout type exists in the resource type registry

@@ -0,0 +20,4 @@
+)
+from cleveragents.infrastructure.database.models import Base
+
+runner = CliRunner()

@@ -0,0 +102,4 @@
+# ---------------------------------------------------------------------------
+
+
+@then('the resource type "{name}" should be present in the registry')

@@ -0,0 +14,4 @@
+    [Documentation]    Run "agents resource add git-checkout" and verify it does not
+    ...                produce a "Resource type not found" error. This currently fails
+    ...                because bootstrap_builtin_types() is never called.
+    ${result}=    Run Process    ${PYTHON}    -m    cleveragents    resource    add