spaceship-earth: per-host Multica PAT, root LV growth, headless Obsidian (WDWL-22)

- provision-agent-host.yml: multica_pat now comes from
  vault_multica_pats[inventory_hostname_short], one daemon-<host> token per
  host. A pre_task asserts the key exists (never prints the value) so a
  missing entry fails by host name instead of as a no_log "censored".
- provision-wong-host.yml: spaceship-earth only. Grows the root partition,
  PV and LV/filesystem with growpart + community.general.lvg/lvol;
  idempotent (second run changed=0). Then applies obsidian_headless.
- roles/obsidian_headless: Obsidian's official headless Sync client
  (obsidian-headless 0.0.14) as system user obsync under a sandboxed
  systemd unit with UMask=0077. Vault at /srv/obsidian/vault: everpure/
  and wip/ obsync-only, inbox/ granted to multica via access + default
  ACLs, vault root traverse-only. Verifies the isolation as multica.
  Sign-in to Obsidian Sync stays manual (see the role README).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ansible/playbooks/provision-wong-host.yml

@@ -0,0 +1,84 @@
+---
+# =============================================================================
+# provision-wong-host.yml — spaceship-earth (WDWL-22)
+#
+# spaceship-earth runs exactly ONE agent: wong, the personal vault's librarian
+# and its only writer. No other agent may be pinned to its runtime. The
+# isolation is enforced by the OS, not by agent instructions: Obsidian Sync
+# runs as `obsync`, and Wong's daemon user (multica) can reach inbox/ only.
+#
+# Run order on a fresh host:
+#   1. ansible-playbook playbooks/provision-agent-host.yml --limit spaceship-earth
+#      (multica daemon user, Node.js, multica CLI, Claude Code)
+#   2. ansible-playbook playbooks/provision-wong-host.yml
+#      (root LV growth, headless Obsidian, vault folder isolation)
+#
+# Step 2 needs Node.js and the multica user from step 1, and asserts both.
+# The Obsidian account sign-in is manual; see roles/obsidian_headless/README.md.
+# =============================================================================
+
+- name: Grow the root filesystem to fill the disk
+  hosts: spaceship-earth
+  become: true
+  tags: [wong_disk]
+
+  vars:
+    root_vg: ubuntu-vg
+    root_lv: ubuntu-lv
+
+  tasks:
+    - name: Disk | Find the PV backing the root VG
+      ansible.builtin.set_fact:
+        _root_pv: >-
+          {{ ansible_facts['lvm']['pvs'] | dict2items
+             | selectattr('value.vg', 'equalto', root_vg)
+             | map(attribute='key') | first }}
+
+    - name: Disk | Split the PV into disk and partition number
+      ansible.builtin.set_fact:
+        _root_disk: "{{ _root_pv | regex_replace('p?[0-9]+$', '') }}"
+        _root_partno: "{{ _root_pv | regex_search('[0-9]+$') }}"
+
+    - name: Disk | Install growpart
+      ansible.builtin.package:
+        name: cloud-guest-utils
+        state: present
+
+    # growpart exits 1 with "NOCHANGE" when the partition already fills the disk.
+    - name: Disk | Grow the partition
+      ansible.builtin.command:
+        argv: [growpart, "{{ _root_disk }}", "{{ _root_partno }}"]
+      register: _growpart
+      changed_when: _growpart.rc == 0 and 'CHANGED' in _growpart.stdout
+      failed_when: _growpart.rc != 0 and 'NOCHANGE' not in _growpart.stdout
+
+    - name: Disk | Grow the PV and VG
+      community.general.lvg:
+        vg: "{{ root_vg }}"
+        pvs: "{{ _root_pv }}"
+        pvresize: true
+
+    - name: Disk | Extend the root LV and its filesystem into the free space
+      community.general.lvol:
+        vg: "{{ root_vg }}"
+        lv: "{{ root_lv }}"
+        size: +100%FREE
+        resizefs: true
+
+- name: Headless Obsidian Sync with vault folder isolation
+  hosts: spaceship-earth
+  become: true
+  tags: [obsidian]
+
+  vars:
+    obsidian_headless_vault_path: /srv/obsidian/vault
+    obsidian_headless_device_name: spaceship-earth
+    obsidian_headless_private_folders:
+      - everpure
+      - wip
+    obsidian_headless_shared_folders:
+      - path: inbox
+        user: multica
+
+  roles:
+    - role: obsidian_headless