docs(litellm): correct stale char-rp description -- it is MeroMero/Gemma-4, not the retired GGUF Magidonia seat

The comment still described TheDrummer Magidonia-24B-v4.3 Q6_K on
llama.cpp, which was replaced by the vLLM MeroMero-v2 NVFP4A16 seat on
2026-08-12. Routing was already correct (:8016 is MeroMero); only the
prose was wrong, so anyone reading the config got the wrong model family
entirely.

Records why the seat exists: char-rp-reasoning is a Qwen3.x derivative and
emits ~5-6k chars of CoT per turn regardless of which Qwen RP tune is
loaded. Measured 2026-08-16 on identical prompts -- Dark-Scarlett 6036 ch
vs Fable-Fusion 5323 ch -- so that is the base family, not the finetune,
and no swap within it fixes it. Gemma-4 is the non-thinking seat.

Also pins the mandatory --default-chat-template-kwargs
'{"enable_thinking": false}' rationale from b8f0f4c, and flags that the
temp 1.1 / min_p 0.10 samplers were tuned against the retired
Mistral-family seat and never re-tuned for Gemma-4.

Docs-only: no litellm_params touched, no routing change.

stacks/litellm/conf/config.yaml

@@ -161,17 +161,30 @@ model_list:
           enable_thinking: true
     model_info:
       mode: chat
-  # char-rp -> GGUF dark-romantasy PROSE seat (:8016, llama.cpp, char-rp-gguf stack on
-  #   ana-ml2 GPU 0). TheDrummer Magidonia-24B-v4.3 Q6_K — Magistral (Mistral) RP tune.
-  #   NON-thinking: elite literary prose, zero refusal on dark/explicit scenes, ~65 tok/s,
-  #   tight POV/instruction adherence (live-tested 2026-07-08). Replaced the broken Angel
-  #   NVFP4 serve AND the earlier AEON-rp MTP twin. Sampler A/B-tuned 2026-07-08 vs the
-  #   dvalin-smithy canonical: temp 1.1 / top_p 0.95 / min_p 0.10 / top_k 0, NO repetition
-  #   penalty. min_p 0.10 richened imagery vs 0.03; rep 1.05 REJECTED (injected a stray
-  #   markdown title in a grief scene — rep-style penalties hurt Drummer RP, matching the
-  #   card). No enable_thinking kwarg — meaningless to the Mistral template. Alt prose model
-  #   (swap via the stack .env): MS3.2-PaintedFantasy-v4.1-24B. Callers may override.
-  #   docs/pfi/model-sampler-defaults.md.
+  # char-rp -> MeroMero-v2 NON-THINKING prose seat (:8016, vLLM, meromero-charrp stack on
+  #   ana-ml2 GPU 0). G4-MeroMero-v2-31B NVFP4A16, **Gemma-4 base** (google/gemma-4-31B-it),
+  #   256K ctx, in-house quant. Replaced the GGUF/llama.cpp Magidonia-24B seat 2026-08-12.
+  #
+  #   THIS SEAT EXISTS BECAUSE THE QWEN BASE THINKS INCESSANTLY. char-rp-reasoning is a
+  #   Qwen3.x derivative and emits ~5-6k chars of CoT per turn no matter which Qwen RP tune
+  #   is loaded — that is the base family, not the finetune, and no swap within it fixes it
+  #   (measured 2026-08-16: Dark-Scarlett 6036 ch vs Fable-Fusion 5323 ch on the same
+  #   prompts). Gemma-4 gives a genuinely non-thinking prose seat. Reach for THIS one when
+  #   you want prose without a reasoning trace; reach for char-rp-reasoning when you want
+  #   the deliberation. Best-of-breed per seat — deliberately NOT the same model.
+  #
+  #   Serving flags are load-bearing (commit b8f0f4c): `--tool-call-parser gemma4
+  #   --enable-auto-tool-choice --reasoning-parser gemma4` AND
+  #   `--default-chat-template-kwargs '{"enable_thinking": false}'`. That last flag is
+  #   MANDATORY, not decorative — the gemma4 parser defaults enable_thinking to True, which
+  #   pre-initialises the engine to REASONING and returns null `content` for all plain RP
+  #   prose. Before it was set, every tools-bearing request also 400'd (no parser at all).
+  #   Verified 0 chars reasoning / clean prose end-to-end 2026-08-16.
+  #
+  #   Sampler note: the temp 1.1 / min_p 0.10 / top_k 0 values below were A/B-tuned
+  #   2026-07-08 against the retired Mistral-family Magidonia seat, NOT against MeroMero.
+  #   They have not been re-tuned for Gemma-4 — treat as inherited, not canonical.
+  #   Callers may override. docs/pfi/model-sampler-defaults.md; stacks/meromero-charrp/.
   - model_name: char-rp
     litellm_params:
       model: hosted_vllm/char-rp