[Wave-14a] JEPA-T ternary ingest pipeline (L-S50)

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Summary

Implement a Rust crate crates/jepa_t_ingest/ that streams plaintext corpora into ternary-quantized triplet sequences for JEPA-T training on Trinity silicon.

Technical Details

• Quantizer: quantize_phi_prior(fp_q15: i16) -> i8 matching Wave-9b RTL byte-for-byte
  • Threshold: φ⁻² (Q1.15) = 12533 (0x30F4)
  • if |w| >= 12533 → sign(w); else 0
• Ingest API: ingest_text(input: &str, cfg: &IngestConfig) -> Vec<Triplet>
• CLI: jepa_t_ingest --input corpus.txt --output triplets.bin

Constraints

• R1 CROWN: Rust ONLY, no Python in the crate
• Apache-2.0 license

Deliverables

• crates/jepa_t_ingest/ (full crate with Cargo.toml, src/, tests/, README.md)