feat(expand_root_lv): new role to grow root LV to fill VG + resize fs

Reclaims the half-disk LV left by the Ubuntu Server autoinstall
template default. Idempotent — no-ops cleanly when there are no free PE
in the VG, and exits the play cleanly on hosts without LVM.

Supports ext4 and xfs. Does not handle partition resize (cloud-utils
growpart) — out of scope for the template fix-up case.

Wired into day1_deploy_honcho.yml ahead of the honcho role so newly
provisioned VMs get the fix-up automatically. Suitable to add to any
day1 playbook by simply listing it before the application role.

ansible/roles/expand_root_lv/meta/main.yml

@@ -0,0 +1,23 @@
+---
+galaxy_info:
+  role_name: expand_root_lv
+  author: JARVIS
+  description: >-
+    Idempotent role that extends the root LVM logical volume to fill its
+    volume group and grows the underlying filesystem (ext4 or xfs). Fixes
+    the half-disk LV that the Ubuntu Server autoinstall template ships
+    with by default.
+  license: MIT
+  min_ansible_version: "2.14"
+  platforms:
+    - name: Ubuntu
+      versions:
+        - noble
+        - jammy
+  galaxy_tags:
+    - lvm
+    - cloud-init
+    - homelab
+    - storage
+
+dependencies: []