Reduce shared RAM usage without lowering firmware capacities

Specialize repeater ACL session state, compact recent and flood records, stream Merkle proofs, and release cold OTA buffers safely. Preserve saved formats, stack sizes, table capacities, and OTA source limits. Account for lazy buffers when active and add compatibility, ARM alignment, allocation failure, and queued-response tests.

Validated six representative board/role builds, 1736 native test cases, sanitizer fixtures, and strict documentation. Document the preexisting Wio-E5 Mini flash overflow separately.

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

@@ -174,6 +174,7 @@ jobs:
           python3 -B test/test_common_prefs_commit.py -v
           python3 -B test/test_common_prefs_legacy_rxgain.py -v
           python3 -B test/test_flood_policy_capacity.py -v
+          python3 -B test/test_flood_rule_layout.py -v
           python3 -B test/test_mqtt_prefs_commit.py -v
           python3 -B test/test_identity_and_settings_recovery.py -v
           python3 -B test/test_contact_cache.py -v
@@ -243,6 +244,7 @@ jobs:
           python3 -B test/test_ota_device_deflate_encoder.py -v
           python3 -B test/test_ota_device_deflate_role.py -v
           python3 -B test/test_client_acl_spiffs.py
+          python3 -B test/test_client_acl_role.py -v
           python3 -B test/test_client_acl_metadata.py -v
           python3 -B test/test_client_acl_cli.py -v
           python3 -B test/test_client_acl_response.py -v
@@ -428,9 +430,13 @@ jobs:
           python3 -B test/test_replay_reset_integration.py -v
 
       - name: Verify firmware memory budgets and nRF52 Bluetooth startup
+        env:
+          MESHCORE_REQUIRE_ARM_COMPILER: '1'
         run: |
           bash test/test_build_size_detection.sh
           python3 -B test/test_firmware_ram.py
+          python3 -B test/test_recent_repeater_storage.py -v
+          python3 -B test/test_ota_cold_buffers.py -v
           python3 -B test/test_neighbor_scope_storage.py
           python3 -B test/test_ed25519_compact.py
           python3 -B test/test_cascade_release_package.py