pr-set: pin EmbeddingGemma-2 support

[danielhanchen]

Summary

Adds #247 (EmbeddingGemma-2 support, by @ngxson) to scripts/unsloth/pr-set.json, after #243. #243 stays pinned at its current head, aba4a4c1db96.

Testing

Local mirror of unsloth-pin-preflight.yml, on base b11436 (newest aged upstream release):

Check	Result
Pin merges	all 15 pins merge in order. ggml-org#25731, #70 and #247 go through additive_merge.py, the rest merge cleanly
merge_checks.py	clean (23 python, 192 c++ files)
pin_contract.py	all 15 pins intact. #247: 5 files with new symbols, 213 lines accounted for
scripts/unsloth/test_*.py	all 9 pass

The merged tree builds llama-embedding and llama-server. On the BF16 GGUF its embedding is bit-identical to a build of the upstream EmbeddingGemma-2 change.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-06T16:04:40.416281Z	26d1568	PR opened

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Reviewed commit: 26d1568fef

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Register #247 in the feature coverage manifest

Adding this pin makes the “Every pin is either checked or knowingly unchecked” step in .github/workflows/unsloth-pr-set-lint.yml derive unslothai#247 and require that key in either features or unchecked in scripts/unsloth/feature-checks.json. This commit adds neither, so every push or pull-request validation triggered by this file exits nonzero with unslothai#247 is pinned and appears in neither features nor unchecked; add an appropriate architecture check or a documented unchecked entry.

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