deployment: add mainnet native config override layer

Translate the mainnet config.sequencerConfig overrides (the public common.yaml +
services/*.yaml flat dotted keys) into the nested sequencer_config.jsonnet
override layer the native config builder consumes, mirroring the existing
sepolia-integration and sepolia-alpha layers. Add a regression test asserting
the jsonnet layer stays in lockstep with the combined YAML overrides (folded:

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nimrod-starkware

deployments/sequencer/configs/overlays/hybrid/mainnet/sequencer_config.jsonnet

@@ -0,0 +1,81 @@
+// Overrides layer for the `mainnet` environment (hybrid layout).
+{
+  chain_id: 'SN_MAIN',
+  native_classes_whitelist: '["0x054c5afe61ed27be53b1e4dec5707209a9fcabdb14712fb800fbc60439090115"]',
+  recorder_url: 'http://starknet-mainnet.cende-recorder-proxy.starknet.io/',
+  starknet_url: 'https://feeder.alpha-mainnet.starknet.io/',
+
+  base_layer_config: {
+    bpo1_start_block_number: 23973546,
+    bpo2_start_block_number: 24168146,
+    fusaka_no_bpo_start_block_number: 23934586,
+    starknet_contract_address: '0xc662c410C0ECf747543f5bA90660f6ABeBD9C8c4',
+  },
+
+  batcher_config: {
+    dynamic_config: {
+      n_concurrent_txs: 100,
+    },
+    static_config: {
+      block_builder_config: {
+        bouncer_config: {
+          block_max_capacity: {
+            state_diff_size: 5000,
+          },
+        },
+        execute_config: {
+          n_workers: 12,
+        },
+      },
+      first_block_with_partial_block_hash: {
+        block_hash: '0x12889b177c93baa28b5ee3afc80cb6f4836adac086af4bef25ae1ac762e8a62',
+        block_number: 671813,
+        parent_block_hash: '0x1e68b0d22b14688dc97afa3006a53cf4e62ebcb02102e80f55e8b48f9a28b97',
+      },
+    },
+  },
+
+  committer_config: {
+    storage_config: {
+      cache_size: 50000000,
+    },
+  },
+
+  consensus_manager_config: {
+    context_config: {
+      dynamic_config: {
+        min_l2_gas_price_per_height: '8269292:27400000000,8742344:30100000000',
+      },
+    },
+    staking_manager_config: {
+      dynamic_config: {
+        default_committee: '0,10:0x64,1,0x1,true;0x65,1,0x1,true;0x66,1,0x1,true;0x67,1,0x1,true;0x68,1,0x1,true',
+      },
+    },
+  },
+
+  gateway_config: {
+    static_config: {
+      proof_archive_writer_config: {
+        bucket_name: 'starkware-starknet-mainnet',
+      },
+    },
+  },
+
+  sierra_compiler_config: {
+    audited_libfuncs_only: true,
+  },
+
+  state_sync_config: {
+    static_config: {
+      central_sync_client_config: {
+        sync_config: {
+          store_sierras_and_casms_block_threshold: 103129,
+        },
+      },
+      network_config: {
+        port: 55010,
+      },
+    },
+  },
+}

deployments/sequencer/test/test_native_config.py

@@ -24,6 +24,7 @@
 COMMON_LAYER_DIR = HYBRID_OVERLAYS_DIR / "common"
 INTEGRATION_LAYER_DIR = HYBRID_OVERLAYS_DIR / "sepolia-integration"
 SEPOLIA_ALPHA_LAYER_DIR = HYBRID_OVERLAYS_DIR / "sepolia-alpha"
+MAINNET_LAYER_DIR = HYBRID_OVERLAYS_DIR / "mainnet"
 
 
 def test_deep_merge_preserves_explicit_null():
@@ -178,3 +179,8 @@ def test_integration_layer_jsonnet_mirrors_combined_yaml():
 def test_sepolia_alpha_layer_jsonnet_mirrors_combined_yaml():
     """REGRESSION: same invariant for the `sepolia-alpha` env layer."""
     _assert_layer_jsonnet_mirrors_combined_yaml(SEPOLIA_ALPHA_LAYER_DIR)
+
+
+def test_mainnet_layer_jsonnet_mirrors_combined_yaml():
+    """REGRESSION: same invariant for the `mainnet` env layer."""
+    _assert_layer_jsonnet_mirrors_combined_yaml(MAINNET_LAYER_DIR)