add proxmox_delegate_host variable and update check-exists documentation

- Document proxmox_delegate_host for delegating pct commands to inventory host
- Update check-exists.yml description to reflect vmid or hostname checking
- Document lxc_exists fact set by idempotency check

roles/proxmox_lxc_provision/README.md

@@ -13,7 +13,7 @@ It also includes tasks which may be used individually:
 - `stop.yml`: Stops an LXC container
 - `update.yml`: Updates an existing LXC container
 - `wait.yml`: Waits for SSH to be available on the container
-- `check-exists.yml`: Checks the existence of the LXC with the given hostname
+- `check-exists.yml`: Checks if an LXC exists by `lxc_vmid` or `lxc_hostname`
 
 ## Requirements
 
@@ -41,6 +41,7 @@ It also includes tasks which may be used individually:
 |----------|-------------|---------|
 | `proxmox_api_port` | The port on which the Proxmox API is listening | `8006` |
 | `proxmox_api_validate_certs` | Whether to validate SSL certificates | `false` |
+| `proxmox_delegate_host` | Inventory hostname for delegated tasks (pct commands). Use this to inherit `ansible_become_password` from inventory. | `{{ proxmox_api_host }}` |
 
 ### Required Container Variables
 
@@ -88,6 +89,7 @@ proxmox_api_token_id: "mytoken"
 proxmox_api_token_secret: "{{ vault_proxmox_token }}"
 proxmox_api_validate_certs: false
 proxmox_node: "pve01"
+proxmox_delegate_host: "proxmox_server"  # inventory hostname for become_password
 ```
 
 ### Creating a new LXC from template
@@ -122,7 +124,7 @@ proxmox_node: "pve01"
 
 ### Idempotent Behavior
 
-The role includes idempotency checking. If a container with the specified `lxc_vmid` already exists, the role will skip provisioning and exit gracefully.
+The role includes idempotency checking. If a container with the specified `lxc_vmid` or `lxc_hostname` already exists, the role will skip provisioning and exit gracefully. Sets `lxc_exists` fact for use in subsequent tasks.
 
 ### Using Standalone Tasks
 

roles/proxmox_lxc_provision/defaults/main.yml

@@ -2,6 +2,8 @@
 # Proxmox API connection defaults (optional)
 proxmox_api_port: 8006
 proxmox_api_validate_certs: false
+# Host to delegate pct commands to (use inventory hostname for become_password to work)
+proxmox_delegate_host: "{{ proxmox_api_host }}"
 
 # LXC defaults
 lxc_template: "local:vztmpl/debian-12-standard_12.12-1_amd64.tar.zst"