fix(data_generator): deterministic timestamps with seed, --format both, input validation (#38)

[RanuK12]

Closes #38

Criterios de aceptación cubiertos:

1. ✅ --format both generates both .json and .csv — main() itera sobre ["json","csv"] cuando format="both"
2. ✅ Negative/zero counts fail with validation error — Zod .positive() en count schema
3. ✅ Same seed produces deterministic output — mulberry32 seeded PRNG + deterministicTimestamp()
4. ✅ Tests cubren format handling, count validation, schema basics — 12 tests en tests/data_generator.test.ts
5. ✅ Diagnostic .logd artifact incluido — tests/__data_gen_output__/audit_diagnostic.logd

Verificación:

• npm run build ✅
• npm test ✅ (12/12 tests passing)
• npm run lint ✅

Diagnostic run (seed=42, count=5, format=both):

Wrote 5 entries to audit_20260620092121..json
Wrote 5 entries to audit_20260620092121..csv

Archivos modificados:

• tools/data_generator.ts — nuevo CLI con --format both, validación Zod, RNG determinista
• tests/data_generator.test.ts — 12 tests de cobertura
• tests/__data_gen_output__/audit_diagnostic.logd — artifact de diagnóstico

[RanuK12]

/claim

[RanuK12]

/claim #38

[RanuK12]

/claim

[RanuK12]

/claim

[RanuK12]

/claim

[RanuK12]

Closing for now. Thanks!