fix(partitioning): correct LVM swap sizing and harden UUID fallbacks

roles/partitioning/tasks/main.yml

@@ -3,7 +3,7 @@
   when:
     - system_cfg.features.swap.enabled | bool
     - partitioning_vm_memory is not defined or (partitioning_vm_memory | float) <= 0
-    - system_cfg is not defined or (system_cfg.memory | default(0) | float) <= 0
+    - (system_cfg.memory | default(0) | float) <= 0
   block:
     - name: Read system memory
       ansible.builtin.command: awk '/MemTotal/ {print int($2/1024)}' /proc/meminfo
@@ -272,10 +272,11 @@
         partitioning_lvm_swap_target_gb: >-
           {{
             (
-              [
+              ((partitioning_memory_mb | float / 1024) >= 16.0)
-                (partitioning_memory_mb | float / 1024),
+              | ternary(
-                4
+                  (partitioning_memory_mb | float / 2048),
-              ] | max | float
+                  [(partitioning_memory_mb | float / 1024), 4] | max | float
+                )
             )
             if system_cfg.features.swap.enabled | bool
             else 0
@@ -310,6 +311,7 @@
                 (
                   (partitioning_disk_size_gb | float)
                   - (partitioning_reserved_gb | float)
+                  # CIS partitioning overhead (GB): /home, /var, /var/log, /var/log/audit
                   - (system_cfg.features.cis.enabled | ternary(7.5, 0))
                   - partitioning_lvm_extent_reserve_gb
                   - 4
@@ -514,31 +516,31 @@
           {{
             partitioning_uuid_swap_result.stdout_lines | default([])
             if system_cfg.features.swap.enabled | bool
-            else ''
+            else []
           }}
         partitioning_uuid_home: >-
           {{
             partitioning_uuid_home_result.stdout_lines | default([])
             if system_cfg.features.cis.enabled
-            else ''
+            else []
           }}
         partitioning_uuid_var: >-
           {{
             partitioning_uuid_var_result.stdout_lines | default([])
             if system_cfg.features.cis.enabled
-            else ''
+            else []
           }}
         partitioning_uuid_var_log: >-
           {{
             partitioning_uuid_var_log_result.stdout_lines | default([])
             if system_cfg.features.cis.enabled
-            else ''
+            else []
           }}
         partitioning_uuid_var_log_audit: >-
           {{
             partitioning_uuid_var_log_audit_result.stdout_lines | default([])
             if system_cfg.features.cis.enabled
-            else ''
+            else []
           }}
 
 - name: Mount filesystems
@@ -562,6 +564,7 @@
         opts: "{{ item.opts }}"
         state: mounted
       loop:
+        # ssd: no-op on kernels 5.15+ (btrfs auto-detects); kept for older kernel compat
         - path: ""
           uuid: "{{ partitioning_uuid_root[0] | default(omit) }}"
           opts: >-