spec: support eagle3 for qwen3.5 & 3.6 (#24593)
* spec: support qwen3.5 & 3.6 eagle3 draft
* eagle3: Add deferred boundary checkpoints restore support for hybrid models
* apply suggestions
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* spec: adapt to API change
* spec: fix naming
* cont : add TODO
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
