araharah-executor 1ce35907d5 feat(06-01): CSR graph codec + committed mini-graph fixture + RouteStep.kind (GREEN) ...

- graph.ts: decodeGraph/encodeGraph over the pinned little-endian CSR
  layout; header magic+version+exact byte-size validation BEFORE any view
  allocation (T-06-03/T-06-03b fail-honest null); zero-copy typed-array
  views; street-name pool with UNNAMED_NAME_ID sentinel
- header padded 60 -> 64 bytes so f64 views are 8-byte aligned — unaligned
  Float64Array throws RangeError, making plan-literal offsets incompatible
  with the plan's own zero-copy law (documented deviation; field
  order/content/endian unchanged; consumers inherit via encodeGraph)
- build-mini-graph.mjs + committed mini-graph.bin: hand-built 5x5 grid,
  25 nodes, 80 directed edges, 3 named streets, exactly ONE oneway pair,
  two speed classes (60/30 km/h) — the A* ground truth (G7 pins it)
- types.ts: RouteStep gains optional kind (8 turn kinds) — Engine A
  populates it (06-01); fixture-world steps stay empty arrays (D-10)

2026-10-24 12:07:17 +08:00

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