apollo_starknet_os_program,starknet_os: add the deploy_v2 syscall to the OS

[ron-starkware]

Stack — part 8 of 9 (base: #14817). Targets 0.14.5.

Implements deploy_v2 in the proving OS: execute_deploy_v2 derives with get_contract_address_blake_escaped (no pedersen builtin pointer), plus the selector, the dispatch arm and the generated DEPLOY_V2_*_GAS_COST constants, and the SNOS syscall-executor delegation.

Like deploy, deploy_v2 is excluded from the virtual OS, so the virtual-OS program hash is unchanged and the frozen stwo proof fixtures are untouched.

The dispatch arm is placed last in the OS syscall if-chain, just before the meta_tx fallthrough, so adding it costs no extra selector comparison to any pre-existing syscall — only meta_tx (the terminal fallthrough) pays, +2 steps (MetaTxV0 1307→1309, META_TX_V0_GAS_COST 168550→168750, in 0_14_5). An arm inserted mid-chain would have taxed every syscall after it.

🤖 Generated with Claude Code

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• starknet_os_flow_tests: prove a block with a DeployAccount v4 end-to-end #14819
• apollo_starknet_os_program,starknet_os: add the deploy_v2 syscall to the OS #14818 👈 (View in Graphite)
• blockifier: add the deploy_v2 syscall (Blake2 contract address derivation) #14817
• apollo_http_server,apollo_gateway_types: accept DeployAccount v4 at the gateway #14816
• blockifier: enable DeployAccount v4 execution #14815
• starknet_os: support DeployAccount v4 Blake2 address derivation in the OS #14814
• starknet_api: add DeployAccount v4 transaction type (Blake2 address derivation) #14813
• starknet_api: escape the Pedersen image in Blake2 contract address derivation #14812
• starknet_api: make contract address derivation hash-pluggable #14811
• main

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