Add Qwen3.5 export support for 0.8B/2B/4B#17800

Merged

lucylq merged 15 commits intopytorch:mainfrom

Phineas1500:qwen3_5_phase1

Mar 6, 2026

Commits on Mar 2, 2026

Commits on Mar 4, 2026

Harden Qwen3.5 conversion key handling and tests
Phineas1500
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