Fix watchdog test timing and run hardware regression fixtures in CI

Arm the test watchdog through initial loop service and assert both recovery boundaries. Update cooperative contact negative controls for the current background APIs and run the existing USB, contact persistence, and startup regressions in Actions.

Validation: 1762 native tests, 48 added-workflow fixture tests, and 18 related persistence/logging checks passed locally.

.github/workflows/run-unit-tests.yml

@@ -159,6 +159,7 @@ jobs:
 
       - name: Verify receive recovery and pinned radio status transport
         run: |
+          python3 -B test/test_dispatcher_startup_watchdog.py -v
           python3 -B test/test_radio_receive_contract.py
           python3 - <<'PY'
           from pathlib import Path
@@ -244,13 +245,21 @@ jobs:
           python3 -B test/test_esp32_usb_serial_hygiene.py
           python3 -B test/test_esp32_tinyusb_nonblocking.py
           python3 -B test/test_esp32_usb_session_fix.py
+          python3 -B test/test_hwcdc_tx_backport.py -v
+          python3 -B test/test_esp32_file_buffer_fix.py -v
           python3 -B test/test_companion_usb_logging_reply.py
           python3 -B test/test_esp32_tinyusb_cooperative_output.py
           python3 -B test/test_esp32_tinyusb_role_hygiene.py
           python3 -B test/test_stm32_float_conversion.py
 
       - name: Verify Companion contact persistence and OTA sleep guards
-        run: python3 -B test/test_companion_contact_sleep_contract.py -v
+        run: |
+          python3 -B test/test_companion_contact_sleep_contract.py -v
+          python3 -B test/test_esp32_cooperative_contacts.py -v
+          python3 -B test/test_esp32_contact_writer_batch.py -v
+          python3 -B test/test_esp32_contact_crc_batch.py -v
+          python3 -B test/test_esp32_contact_publication.py -v
+          python3 -B test/test_esp32_advert_cache.py -v
 
       - name: Verify Companion Bluetooth CLI connection protection
         run: python3 -B test/test_companion_bluetooth_control.py -v