feat(dllm): gemma4 streaming parser emitting ChatDeltas

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Fragment-safe state machine (content / channel header / thought /
tool-call / done) classifying model output into content,
reasoning_content and tool_calls deltas. Tool-call payload decoder is a
non-partial port of vLLM's gemma4 parser grammar; ~25 of its test cases
are ported with citations, plus a 2-split invariance property over
every byte position. Recursion depth-capped against model-generated
deep nesting; marker constants shared with the renderer.

Assisted-by: Claude Code (Fable 5)
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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