✨ feat(playbook): add install_mode deployment config

BREAKING CHANGE: [vendor] and playbook.deploy_root are no longer supported. Use [playbook].install_mode and playbook.playbook_root instead.

tests/test_deployment_routes_e2e.py

@@ -85,6 +85,8 @@ class DeploymentRoutesE2ETests(unittest.TestCase):
                 """
 [playbook]
 project_root = "."
+playbook_root = "docs/standards/playbook"
+install_mode = "subtree"
 
 [sync_rules]
 no_backup = true
@@ -119,7 +121,7 @@ no_backup = true
             self.assertIn("@AGENT_RULES.md", text)
             self.assertIn("<!-- playbook:claude:start -->", text)
 
-    def test_external_clone_deployment_vendors_snapshot_and_updates_claude(self):
+    def test_external_clone_deployment_installs_snapshot_and_updates_claude(self):
         with tempfile.TemporaryDirectory() as tmp_dir:
             tmp_root = Path(tmp_dir)
             external_clone = tmp_root / "playbook"
@@ -137,10 +139,8 @@ no_backup = true
                 f"""
 [playbook]
 project_root = "."
-deploy_root = "{CUSTOM_DEPLOY_ROOT.as_posix()}"
-
-[vendor]
-langs = ["tsl", "markdown"]
+playbook_root = "{CUSTOM_DEPLOY_ROOT.as_posix()}"
+install_mode = "snapshot"
 
 [sync_rules]
 no_backup = true