Fix ansible-lint violations: FQCN, formatting, bugs, role renames

- Auto-fix FQCN, YAML formatting, jinja spacing, and free-form module
  syntax via ansible-lint --fix
- Fix comments misplaced inside module args by the auto-fixer
  (bluetooth-monitor, pi_standard_setup, pi_musicmouse)
- Fix notify: references left stale (lowercase) after handler names
  were re-cased, which would have silently broken reboot/restart
  handlers (pi_disable_onboard_bluetooth, pi_hifiberry_amp,
  pi_squeezelite, pi_standard_setup)
- Fix a task in pis/debmatic-install.yml missing its module name
  (apt_repository), which caused a real syntax-check failure
- Add missing play names, fix comment spacing, literal-compare idiom,
  and no-changed-when annotations
- Delete unused/broken roles/better-shell-env (unreferenced, invalid YAML)
- Rename all hyphenated role directories to underscore form to satisfy
  ansible-lint's role-name rule, updating every playbook/meta reference

Remaining lint findings (var-naming, package-latest, risky-file-permissions,
no-handler) intentionally left for follow-up per user decision.

roles/pi_dhtsensor_circuitpython/templates/dht22_sensing.json

@@ -0,0 +1,12 @@
+{
+  "ha_url": "{{home_assistant_url}}",
+  "token": "{{home_assistant_token}}",
+  "dht_pin": "{{dht_pin}}",
+  "polling_sleep_time_seconds": "{{dht_polling_sleep_time_seconds}}",
+
+  "ha_temp_sensor_name": "{{sensor_room_name_ascii|lower}}_dht22_temperatur",
+  "ha_temp_friendly_name": "{{sensor_room_name}} Temperatur",
+
+  "ha_humidity_sensor_name": "{{sensor_room_name_ascii|lower}}_dht22_luftfeuchtigkeit",
+  "ha_humidity_friendly_name": "{{sensor_room_name}} Luftfeuchtigkeit"
+}