feat(litellm): wire canonical sampler defaults for all 4 gateway seats
dvalin-smithy canonical set, infra-ops triaged + char-rp A/B-validated on the live serve.
- gen (+summarizer-large twin): presence_penalty 1.0 -> 1.5 (Qwen3.6 non-thinking rec).
- gen-reasoning: temp 0.6 -> 1.0, presence 1.0 -> 1.5 (Qwen general-thinking profile;
the old 0.6 was the coding sub-profile).
- char-rp: temp 1.0 -> 1.1, min_p 0.03 -> 0.10, top_k 0, NO rep. A/B on 2 dark-romantasy
prompts: min_p 0.10 richened imagery; repeat_penalty 1.05 REJECTED (injected a stray
markdown title, hurts Drummer/Magistral RP creativity per the card + dvalin's own note).
- char-rp-reasoning: add explicit top_p 0.95 (else per the RpR card: no rep/DRY/XTC).
Canonical reference: docs/pfi/model-sampler-defaults.md (mirrors dvalin's derivation).
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