feat(openrouter): wire Pareto Code router with min_coding_score knob (#22838)

Pick openrouter/pareto-code as your model and OpenRouter auto-routes each
request to the cheapest model meeting your coding-quality bar (ranked by
Artificial Analysis). The new openrouter.min_coding_score config key (0.0-1.0,
default 0.65) tunes the floor.

- hermes_cli/models.py: add openrouter/pareto-code to OPENROUTER_MODELS so
  it shows up in the picker with a description
- hermes_cli/config.py: add openrouter.min_coding_score (default 0.65 — lands
  on a mid-tier coder on the current Pareto frontier)
- plugins/model-providers/openrouter: emit extra_body.plugins =
  [{id: pareto-router, min_coding_score: X}] when model is openrouter/pareto-code
  AND the score is a valid float in [0.0, 1.0]
- agent/transports/chat_completions.py: same emission on the legacy flag
  path (when no provider profile is loaded)
- run_agent.py: openrouter_min_coding_score kwarg + storage; plumbed into
  both build_kwargs() invocations and the context-summary extra_body path
- cli.py: read openrouter.min_coding_score once at init, validate float in
  [0,1], pass to AIAgent constructions (CLI + background-task paths)
- cron/scheduler.py, batch_runner.py, tools/delegate_tool.py,
  tui_gateway/server.py: propagate the kwarg (mirrors providers_order
  plumbing — subagents inherit, cron/batch read from config)
- tests: profile-level + transport-level coverage of the model gating,
  unset/empty/out-of-range handling, and the legacy flag path
- docs: new 'OpenRouter Pareto Code Router' section in providers.md

Verified end-to-end against api.openrouter.ai: at score=0.65 we land on a
mid-tier coder, at omission we get the strongest. Score is silently dropped
on any model other than openrouter/pareto-code, so it's safe to leave set.

agent/transports/chat_completions.py

@@ -323,6 +323,21 @@ class ChatCompletionsTransport(ProviderTransport):
         if provider_prefs and is_openrouter:
             extra_body["provider"] = provider_prefs
 
+        # Pareto Code router plugin — model-gated. Same shape as the
+        # profile path in plugins/model-providers/openrouter/__init__.py;
+        # this branch only runs when the OpenRouter profile isn't loaded.
+        if is_openrouter and model == "openrouter/pareto-code":
+            _pareto_score = params.get("openrouter_min_coding_score")
+            if _pareto_score is not None and _pareto_score != "":
+                try:
+                    _pareto_score_f = float(_pareto_score)
+                except (TypeError, ValueError):
+                    _pareto_score_f = None
+                if _pareto_score_f is not None and 0.0 <= _pareto_score_f <= 1.0:
+                    extra_body["plugins"] = [
+                        {"id": "pareto-router", "min_coding_score": _pareto_score_f}
+                    ]
+
         # Kimi extra_body.thinking
         if is_kimi:
             _kimi_thinking_enabled = True
@@ -463,6 +478,7 @@ class ChatCompletionsTransport(ProviderTransport):
             model=model,
             base_url=params.get("base_url"),
             reasoning_config=reasoning_config,
+            openrouter_min_coding_score=params.get("openrouter_min_coding_score"),
         )
         if profile_body:
             extra_body.update(profile_body)