Status: IN
The stock exchange demonstrates that write-path structural correctness scales to complex multi-step mutations: price-time priority matching is a composite write operation (match against book, fill partial orders, cancel or rest the remainder) where structural discipline (FIFO deques, sorted price levels) ensures each step is valid — write correctness handles compositional complexity, not just single-step simplicity.
Stock exchange proves write-path structural correctness scales to composite multi-step operations
Depends on (SL): stock-exchange-matching-produces-valid-trades, write-path-is-self-consistent-by-design