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docs: end-of-day handoff — 5 of 8 ported, 11 tests green

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Rewrites OPSTACK-HANDOFF.md for a fresh context: the port table, what is left in
order, the two things Phase 2 invented that were not in the original design (height
space as a second operator family, and IVoxelBiomeField so ops depend on a capability
rather than the generator), and the method lessons that cost build cycles to learn.

Open items, none blocking: perf (parked by Jahni), C9's library half (no measured
risk), VerticalShafts' pessimistic box verdicts, and ClassifyTile still using
hand-written guards while ClassifyBox sits verified but unconsumed — which is where
the measured tile-skipping would actually become frames.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Fr0zka
2026-07-27 17:17:35 +02:00
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@@ -1774,3 +1774,26 @@ instead of "a shaft exists nearby", which is `§6`'s split argument arriving thr
Then `FloatingIslands` (§7) → `Underwater` (§8) → `TunnelNetwork` (§2, **last**). Perf still parked.
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## 2026-07-27 — END OF DAY 2. All 11 tests green. 5 of 8 archetypes ported.
The params fingerprint fixed the overhang regression; the full `VoxelForge` filter is green.
**Ported and wired, all bit-identical to their originals:** Maze · FlatPlain · CrystalChamber ·
SurfaceWorld (biomes included) · VerticalShafts.
**Remaining ports:** `FloatingIslands` (§7) → `Underwater` (§8) → `TunnelNetwork` (§2, **last**).
**Open items, none blocking:**
- **Perf** — op path is slower; parked by Jahni until the transition is complete. One cause fixed.
- **`§C9` library half** — `sinf`/`cosf` not IEEE-754; 0 samples measured at risk. Run the digest on
Linux and pin it when the platforms agree.
- **VerticalShafts proves 0 of 60 tiles** — pessimistic `EffectOverBox`, not a hole.
- **`ClassifyTile` still hand-written** — `ClassifyBox` is verified but unconsumed. This is where the
measured tile-skipping becomes actual frames, and it is arguably the biggest win left.
`OPSTACK-HANDOFF.md` rewritten for a fresh context: current state, what is left in order, the two
things Phase 2 invented (height space, `IVoxelBiomeField`), and the method lessons that were paid for
in build cycles.
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