suaveplan/openspec/changes/enterprise-gaming-spatial-hash/tasks.md

Tasks: enterprise-gaming-spatial-hash

0. Pre-flight (non-negotiable)

• 0.1 Confirm clean working tree (git status reports nothing) and no in-flight worktrees with uncommitted work (git worktree list then git status in each)
• 0.2 If any worktrees exist under .claude/worktrees/, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (git worktree remove) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
• 0.3 Confirm the package set in MANIFEST.md matches find packages -maxdepth 3 -name package.json count. Drift here means a prior change archived without regenerating the manifest.

Phase 1 — Scaffold

• Create gaming/engine/spatial-hash/ (@suaveplan/spatial-hash, 0.1.0, sideEffects: false)
• tsconfig.json, vitest.config.ts

Phase 2 — Error codes & constants

• src/error-codes.ts — SpatialHashError, SPATIAL_HASH.* codes
• src/constants/index.ts — DEFAULT_INITIAL_CAPACITY

Phase 3 — Types

• src/types/common.ts + common.md

Phase 4 — Hash utilities

• src/utils/hash.ts — hashCell2D(cx, cy), hashCell3D(cx, cy, cz) using integer cantor/XOR hash
• Tests + docs

Phase 5 — 2D spatial hash

• src/core/spatial-hash-2d/spatial-hash-2d.ts — insert/remove/move/queryRadius/queryAABB
• Float32Array position cache
• OTel histogram + gauge
• Tests + docs

Phase 6 — 3D spatial hash

• src/core/spatial-hash-3d/spatial-hash-3d.ts — same surface, 3D coordinates
• Tests + docs

Phase 7 — Property tests

• tests/property.test.ts — fast-check: query completeness, no false negatives, size invariants

Phase 8 — Pre-publish gate

• bunx turbo lint typecheck test --filter=@suaveplan/spatial-hash green
• 100% coverage
• Publish: bun scripts/publish.ts --package @suaveplan/spatial-hash