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README.md

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+# Mandelbrot Viewer — runtime-cost removal build
+
+Production source of truth is `index.html`.
+
+This build starts from the integrated five-improvement viewer and applies the A/B-supported runtime-cost removals. The numerical architecture remains direct f32 / perturbation + series / sparse recovery / finite continuation / CPU fallback.
+
+## Validation
+
+```bash
+node tests/regression.mjs
+node experiments/ab/variant_check.mjs index.html
+node experiments/ab/supplement.mjs
+node experiments/integrated_bench.mjs docs/removal-pass/integrated-bench.json
+```
+
+The optional real-browser WebGPU test is `tests/browser_smoke.mjs`; it requires Chromium with a working WebGPU backend.
+
+## Current records
+
+- `docs/removal-pass/IMPLEMENTATION.md` — why each runtime cost was removed or retained
+- `docs/removal-pass/results.json` — structural checks, hashes, and A/B evidence
+- `docs/removal-pass/integrated-bench.json` — post-removal CPU/surrogate benchmark
+
+Historical investigation records remain under `docs/performance-cost-audit/` and `docs/integrated-improvements/`.
+
+## Reported deep-view artifact fix (2026-09-29)
+
+A reported deep URL exposed an unsafe 4th-order series jump and premature publication of FAST numerical failures. Production series acceleration is disabled pending a propagated error-bound redesign, and FAST provisional publication now occurs only after numerical failure repair. See `docs/reported-view-bugfix/IMPLEMENTATION.md`.