release: heb-diac-small-1.0 (gated ByT5-small student, +5.58pp)

[ronaldtse]

Summary

• Server-tier Hebrew student: ByT5-small via logit KD from s43 (beam-4 semantics), hebrew-v4 corpus
• Gate: student 30.37% DER vs teacher 24.79% (greedy, Nakdimon IMF split, 1,864 sentences) = +5.58pp, inside the ~5.6pp pre-accepted budget (DISTILL-SOURCE-PROMPT section 2)
• RESULTS.md anchor + metrics-sources entry + modal_export registration

Test plan

• CI green
• export fp32 -> parity -> publish chain follows