fix(session): route all Muse family models to the Meta system prompt - #41581
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The system prompt dispatcher only matched the substring "muse-spark", so
newer Muse models such as muse-glimmer / muse-glimmer-30b fell through to
PROMPT_DEFAULT instead of receiving PROMPT_META.
Gate PROMPT_META on any "muse" model id and template the model name into
the prompt via {{MODEL_NAME}}: render "Muse Glimmer" for muse-glimmer ids
and default to "Muse Spark" for every other Muse model.
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The system prompt dispatcher only matched the substring "muse-spark", so newer Muse models such as muse-glimmer / muse-glimmer-30b fell through to PROMPT_DEFAULT instead of receiving PROMPT_META.
Gate PROMPT_META on any "muse" model id and template the model name into the prompt via {{MODEL_NAME}}: render "Muse Glimmer" for muse-glimmer ids and default to "Muse Spark" for every other Muse model.
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