v1.5.16

• Add __codesize(RUNTIME): resolves at compile time to the byte length of the runtime section
  (MAIN body + appended runtime tables). Usable in both MAIN and CONSTRUCTOR (directly or via a
  derived #define constant). The self-referential MAIN-side case converges via iterative MAIN
  codegen, bounded by EIP-170 (at most PUSH2). Enables Solidity-style immutables that the
  runtime reads at compile-time literal offsets, with no runtime codesize arithmetic. Not
  allowed inside code tables (would create a circular sizing dependency). RUNTIME is reserved
  as a macro name.
• hnc --bin-runtime (-r) now errors when the contract's CONSTRUCTOR returns its own bytecode,
  instead of silently emitting MAIN, which would not match the deployed runtime. Constructors
  that only initialize state (no RETURN) are unaffected.
• Update dependencies.