feat(temple): sacred statistics + zenodo utils (V40) (#415)

Scientific infrastructure improvements for NeurIPS 2026 submission:

 sacred_statistics.zig (387 LOC):
 - φ-based confidence intervals (CI95, CI90)
 - Welch's t-test for unequal variances
 - Cohen's d effect size (φ-adjusted)
 - Sacred distance metric: d(a,b) = |a-b|/φ
 - Correlation, median, percentile calculations
 - Sacred variance: σ²_φ = σ² · (1 + φ⁻²)

 zenodo_utils.zig (517 LOC):
 - PublicationMetadata struct (NeurIPS/ICLR compliant)
 - Citation formats: BibTeX, APA, IEEE, MLA, Chicago
 - VersionManager with semver support
 - DOIHelper utilities (extraction, validation)
 - NeurIPSMetadata helper for conference submissions

Total: ~904 new LOC
Tests: 12/12 passing (7 sacred + 5 zenodo)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Antigravity Agent