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Qwen3-Embedding family on Ollama supports Matryoshka truncation via the 'dimensions' field on /v1/embeddings. Without this passthrough, gbrain ignores user-selected reduced dims and the provider returns its native size, causing dim-mismatch errors against brains configured for narrower widths (e.g. existing 1536-dim brains). Matches by bare name 'qwen3-embedding' or any tag variant 'qwen3-embedding:0.6b' / ':4b' / ':8b'. Native dims: 0.6B=1024, 4B=2560, 8B=4096. All MRL-truncatable. 5 new tests; full AI suite 137/137 green. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Co-authored-by: Time Attakc <89218912+time-attack@users.noreply.github.com>