This file is a turn-key quickstart for pointing an AI (or yourself) at a Zig codebase that needs a 0.15.x → 0.16.0 migration. It's small on purpose. The actual reference material lives in ZIG-0.16.0.md (1,800+ lines of changelog, patterns, decoder tables, and workflow playbook distilled from a real end-to-end port).
It IS: A field-tested migration playbook that took a ~7,300-line Zig 0.15.2 parser generator to 0.16.0 in one session. Tests passed 40/40 afterwards. Performance went up (187s → 1.73s test runtime). It captures both the API changes and the surprises that aren't obvious from release notes alone — most importantly, std.heap.DebugAllocator's up-to-1400× slowdown on allocator-heavy workloads in Debug builds.