Persist unchanged Companion channel route SETs before OK

Require a real raw-table save for same-value channel SETs. This repairs the false acknowledgement after successful constructor recovery of an older backup followed by a failed candidate write.

Keep resolved alias keys, raw AUTO policy and runtime generation untouched. Preserve GET and unchanged contact behavior, changed-policy validation and indeterminate-publication quarantine.

Cover real stale-backup creation, failure/retry, reboot and exact old-skip controls. Add actual alias/BaseChatMesh and raw app-key regression tests on all four backends. Verified 117 related host tests, 16 final caller rechecks, four firmware qualifications and linked nRF52 crypto checks.

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

@@ -323,6 +323,7 @@ jobs:
           python3 -B test/test_companion_channel_alias.py -v
           python3 -B test/test_companion_tx_routing.py -v
           python3 -B test/test_companion_channel_publication.py -v
+          python3 -B test/test_companion_tx_raw_alias.py -v
           python3 -B test/test_companion_traffic_routing.py -v
           python3 -B test/test_ethernet_kiss.py -v
           python3 -B test/test_ethernet_radio.py -v