🧪 GF16 Validation — encode/decode roundtrip + size check

[gHashTag]

Task

Implement GF16 quantization validation workflow.

Requirements

• Encode model → GF16 binary
• Decode GF16 → verify reconstruction (roundtrip error < 1e-6)
• Size check: model_size < 16MB
• Validation on all 5 seeds from trios-submit

Acceptance

• Roundtrip error < 1e-6 on encode/decode
• GF16 size < 16MB verified
• Test coverage: cargo test -p trios-quantize gf16_roundtrip

Output

• `crates/trios-quantize/src/gf16.rs` — GF16 encode/decode impl
• Integration test `tests/gf16_roundtrip_test.rs`

Part of: 🏆 EPIC: Parameter Golf Submission — Trinity + GF16

Blocker: RFC #107 (trios-proto) for Envelope protocol