plan(N.4): full implementation plan + CLAUDE.md pointer

28-task plan covering 4 weeks of work organized as:
- Week 1 (Tasks 1-10): WB plumbing + atlas for static scenery + conformance
- Week 2 (Tasks 11-15): streaming integration + memory budget verification
- Week 3 (Tasks 16-21): per-instance customization + animation
- Week 4 (Tasks 22-28): full draw dispatcher + visual verification + ship

Living document — task checkboxes marked as commits land; adjustments
appended in-place rather than rewriting earlier tasks. Conformance
tests run before substitution per N.1/N.3 pattern. Behind
ACDREAM_USE_WB_FOUNDATION=1 feature flag during weeks 1-3.

CLAUDE.md updated with a "Currently in flight" pointer in the Roadmap
discipline section so future agents pick up the plan as authoritative
for rendering work.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -437,6 +437,16 @@ acdream's plan lives in two files committed to the repo:
   acceptance criteria. Do not drift from the spec without explicit user
   approval.
 
+**Currently in flight: Phase N.4 — Rendering Pipeline Foundation.** Plan
+at [`docs/superpowers/plans/2026-05-08-phase-n4-rendering-foundation.md`](docs/superpowers/plans/2026-05-08-phase-n4-rendering-foundation.md).
+Spec at [`docs/superpowers/specs/2026-05-08-phase-n4-rendering-foundation-design.md`](docs/superpowers/specs/2026-05-08-phase-n4-rendering-foundation-design.md).
+This is a 3-4 week phase adopting WB's `ObjectMeshManager` + `TextureAtlasManager`
+as our shared rendering infrastructure. The plan is a **living document** —
+task checkboxes get marked as commits land, adjustments are appended in-place,
+weeks 2-4 may be revised based on week 1 discoveries. Read the plan's "Plan
+Living-Document Convention" section before contributing. After N.4 ships
+this pointer is removed and the plan's status flips to "Final."
+
 **Rules:**
 
 1. Before starting a new phase or sub-piece, re-read the roadmap and the