Fix become-precedence bug, dead Tailscale install path, and make meshcore config self-sufficient

- ansible_become: true as a group_vars connection variable silently took
  precedence over every task-level `become: false` in this repo, so
  every "unprivileged" task (pipx installs, user script deploys,
  legacy .env.local writes) was actually running as root the whole
  time. Move become to a play-level keyword in site.yml instead, which
  correctly loses to a task's own become: false. Also stop relying on
  ansible_env.HOME (which reflected root's home once facts were
  gathered under the old broken setup) and use /home/{{ remote_user }}
  directly, with explicit owner/group so ownership self-heals.
- meshcore_capture: 99-user.toml.j2 now defines every broker
  (including letsmesh-us/eu) fully rather than assuming
  config.d/10-letsmesh.toml was auto-installed — that preset only gets
  created on some install paths (fresh install) and not others
  (migrate), so the old partial-override form silently dropped
  brokers on migrated nodes.
- base: install libffi-dev/pkg-config on armv6 (Pi Zero W) — cffi has
  no prebuilt wheel for that architecture and fails to compile
  without the headers.
- dm-ashwell: migrated off the legacy layout to the current
  installer's system-service layout; drop its layout override now
  that it matches the group default.
- meshcore-capture-update.sh: fix a YAML folded scalar (>-) collapsing
  the shebang and command onto one line, corrupting the script.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

ansible/roles/meshcore_capture/tasks/main.yml

@@ -29,7 +29,9 @@
 - name: Write .env.local config (legacy layout)
   template:
     src: env.local.j2
-    dest: "{{ ansible_env.HOME }}/.meshcore-packet-capture/.env.local"
+    dest: "/home/{{ remote_user }}/.meshcore-packet-capture/.env.local"
+    owner: "{{ remote_user }}"
+    group: "{{ remote_user }}"
     mode: "0640"
   become: false
   when: meshcore_capture_layout == 'legacy'
@@ -56,11 +58,12 @@
 
 - name: Deploy meshcore-capture-update script
   copy:
-    content: >-
+    content: |
       #!/usr/bin/env bash
-
       bash <(curl -fsSL https://raw.githubusercontent.com/agessaman/meshcore-packet-capture/main/install.sh){{ ' --update' if meshcore_capture_layout != 'legacy' else '' }}
-    dest: "{{ ansible_env.HOME }}/meshcore-capture-update.sh"
+    dest: "/home/{{ remote_user }}/meshcore-capture-update.sh"
+    owner: "{{ remote_user }}"
+    group: "{{ remote_user }}"
     mode: "0755"
   become: false
 
@@ -69,6 +72,8 @@
     content: |
       #!/usr/bin/env bash
       sudo journalctl -u {{ 'meshcore-capture' if meshcore_capture_layout == 'legacy' else 'meshcore-packet-capture' }} -f
-    dest: "{{ ansible_env.HOME }}/meshcore-capture-logs.sh"
+    dest: "/home/{{ remote_user }}/meshcore-capture-logs.sh"
+    owner: "{{ remote_user }}"
+    group: "{{ remote_user }}"
     mode: "0755"
   become: false