GRM-16: test: add molecule lifecycle scenarios, integration tests, and docs

- Add multi-instance molecule scenario verifying isolated data/config dirs
- Add lifecycle molecule scenario testing stop/disable/enable/start sequence
- Update default and binary verify playbooks for template unit assertions
- Add integration tests for full CLI lifecycle and multi-instance support
- Add pytest integration marker and --no-cov Makefile target
- Update README with lifecycle commands, multi-instance examples, and architecture
- Update Makefile with start/stop/enable/disable/status/remove targets
- Update .env.example with GRM_LANG documentation

ansible/roles/gitea-runner/molecule/lifecycle/side_effect.yml

@@ -0,0 +1,36 @@
+---
+- name: Stop runner instance
+  hosts: all
+  become: true
+  vars:
+    runner_name: "lifecycle-test-runner"
+  tasks:
+    - name: Stop gitea-runner systemd instance
+      ansible.builtin.systemd:
+        name: "gitea-runner@{{ runner_name }}"
+        state: stopped
+        daemon_reload: true
+
+    - name: Disable gitea-runner systemd instance
+      ansible.builtin.systemd:
+        name: "gitea-runner@{{ runner_name }}"
+        enabled: false
+        daemon_reload: true
+
+- name: Re-enable and start runner
+  hosts: all
+  become: true
+  vars:
+    runner_name: "lifecycle-test-runner"
+  tasks:
+    - name: Enable gitea-runner systemd instance
+      ansible.builtin.systemd:
+        name: "gitea-runner@{{ runner_name }}"
+        enabled: true
+        daemon_reload: true
+
+    - name: Start gitea-runner systemd instance
+      ansible.builtin.systemd:
+        name: "gitea-runner@{{ runner_name }}"
+        state: started
+        daemon_reload: true