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Evan
22d5aba5ae
## Summary Follow-up to #4494. That PR added `forEachNeighborNSWE` as a third neighbor iterator because the existing allocation-free helpers (`forEachNeighbor`, `neighbors4`) visit in W,E,N,S order while `neighbors()` visits N,S,W,E — and substituting one for the other changes simulation behavior at order-sensitive call sites. This PR removes that duplication by standardizing on **one order everywhere**: `forEachNeighbor` and `neighbors4` now visit in the same N,S,W,E order as `neighbors()`, and `forEachNeighborNSWE` is deleted. ## ⚠️ Intentional behavior change Callers of the flipped helpers that are order-sensitive now make different (equally valid) decisions: - `AttackExecution.addNeighbors` — PRNG values are drawn per neighbor while building the conquest frontier, so attack expansion patterns differ - `AttackExecution.handleDeadDefender` — a dead defender's tiles go to the *first-visited* adjacent player - `WarshipExecution.bestNeighborToward` — distance ties break by visit order - `PlayerExecution` surrounded-cluster flood fill — set insertion order propagates to conquer order Game outcomes for a given seed differ from previous builds (verified: the 12k-tick reference run ends with 31 players alive vs 24 before). Determinism across clients *within* a build is unaffected — all clients run the same code, so there is no desync risk. Replays/verification pinned to old hashes will not match this build. New reference hashes for the headless perf harness (seed `perf-default`): | Run | Final hash | |---|---| | giantworldmap, 12,000 ticks | `57830793797434300` | | giantworldmap, 2,000 ticks | `55125379638382860` | | world, 1,800 ticks | `32337437717390864` | ## Verification - [x] Full suite green (1,901 tests), including new exact-order contract tests: `forEachNeighbor` and `neighbors4` must match `neighbors()` contents **and order** for every tile - [x] 20-game-minute Giant World Map benchmark: no perf regression (73 ticks/sec, GC 1.2% of wall, allocation profile unchanged) - [x] Order-sensitivity audit of every `forEachNeighbor`/`neighbors4` call site (sensitive ones listed above; the rest are booleans, counts, or min/max accumulations) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Fable 5 <noreply@anthropic.com>