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feat: extract guarded ephemeris ranges for browsers - #4
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Browsers currently need the full ephemeris even for one chart. Add guarded date-range extraction that copies existing coefficient blocks without refitting, plus optional overlapping two-year loading in the configurable-chart example. The runtime format, chart calculations and R2 Worker adapter remain unchanged.
dataset-builder extractvalidates source integrity, preserves fitted guard margins and emits a manifest with exact coverage and source/output hashes. The browser example switches verified files within one Wasm instance and includes an optional Human Design design-date export and parity harness.Validation: workspace tests/formatting/Clippy, Wasm build/Clippy, example TypeScript/build, boundary and host verification checks passed. Actual Wasm comparisons across 300 segments matched 4,713 natal charts and 1,570 design charts with zero differences. Headless Chrome verified A → B → A with two segment downloads and one Wasm initialization. Independent review found no blockers and independently ran four extractor tests. These are same-engine parity checks, not independent astronomical validation.
Dependent private website PR: https://github.com/jacksteamdev/astrology-engine-website/pull/4. It pins this commit and generates browser assets from its existing hash-pinned dataset release. No generated binaries are committed. Verification details:
docs/verification/ephemeris-extraction.md.