SimurgArray: master plan, repo scaffolding and data/ref fetch scripts

Phase 0 deliverables: full technical specification and roadmap
(SIMURGARRAY_MASTER_PLAN.md), CLAUDE.md, bootstrap script for reference
open-source repos and tiered dataset fetch script with checksums.

CLAUDE.md

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+# SimurgArray
+Personal research toolkit for Illumina Infinium genotyping arrays (IDAT→GTC→VCF, QC, CN, PGx).
+The full spec and roadmap is SIMURGARRAY_MASTER_PLAN.md — read the relevant section before changing code.
+
+## Rules
+- Work phase by phase (§18). Don't start a phase until the previous gate passes.
+- Science modules (signal/, genotype/, cn/, qc/, pgx/) are pure functions; no I/O inside them.
+- Every algorithm cites its source (§7 tags) in its docstring.
+- MIT/BSD/Apache/Unlicense code may be ported with attribution in THIRD_PARTY_NOTICES.md.
+  GPL tools (plink2, illuminaio, verifyIDintensity) = subprocess oracles only; never copy their code.
+- Never commit vendor data (BPM/CSV/EGT/IDAT) — only tests/fixtures/ (Artistic-2.0 Bioconductor files, synthetic data).
+- Never hide oracle discrepancies; record them in docs/known_unknowns.md.
+- Default mode is bit-exact vs Illumina-produced GTCs; keep a clean-math mode too.
+
+## Commands
+- uv sync ; uv run pytest -q ; uv run ruff check . ; uv run mypy src
+- bash scripts/fetch_data.sh p0|p1|p2 ; bash scripts/bootstrap_refs.sh