fix(config): resolve category to model for Prometheus (Planner) agent (#652)

* fix(config): resolve category to model for Prometheus (Planner) agent

When Prometheus (Planner) was configured with only a category (e.g.,
"ultrabrain") and no explicit model, the category was ignored and the
agent fell back to the hardcoded default "anthropic/claude-opus-4-5".
Add resolveModelFromCategoryWithUserOverride() helper that checks user
categories first, then DEFAULT_CATEGORIES, to resolve category names
to their corresponding models. Apply this resolution when building
the Prometheus agent configuration.

Co-Authored-By: Sisyphus <sisyphus@mengmota.com>

* fix(test): use actual implementation instead of local duplicate

Co-Authored-By: Sisyphus <sisyphus@mengmota.com>

* fix(config): apply all category properties, not just model for Prometheus (Planner)

The resolveModelFromCategoryWithUserOverride() helper only extracted
the model field from CategoryConfig, ignoring critical properties like
temperature, top_p, tools, maxTokens, thinking, reasoningEffort, and
textVerbosity. This caused categories like "ultrabrain" (temperature:
0.1) to run with incorrect default temperatures.

Refactor resolveModelFromCategoryWithUserOverride() to
resolveCategoryConfig() that returns the full CategoryConfig. Update
Prometheus (Planner) configuration to apply all category properties
(temperature, top_p, tools, etc.) when a category is specified, matching
the pattern established in Sisyphus-Junior. Explicit overrides still
take precedence during merge.

Co-Authored-By: Sisyphus <sisyphus@mengmota.com>

---------

Co-authored-by: Sisyphus <sisyphus@mengmota.com>

src/plugin-handlers/config-handler.ts

@@ -24,7 +24,9 @@ import type { OhMyOpenCodeConfig } from "../config";
 import { log } from "../shared";
 import { migrateAgentConfig } from "../shared/permission-compat";
 import { PROMETHEUS_SYSTEM_PROMPT, PROMETHEUS_PERMISSION } from "../agents/prometheus-prompt";
+import { DEFAULT_CATEGORIES } from "../tools/sisyphus-task/constants";
 import type { ModelCacheState } from "../plugin-state";
+import type { CategoryConfig } from "../config/schema";
 
 export interface ConfigHandlerDeps {
   ctx: { directory: string };
@@ -32,6 +34,13 @@ export interface ConfigHandlerDeps {
   modelCacheState: ModelCacheState;
 }
 
+export function resolveCategoryConfig(
+  categoryName: string,
+  userCategories?: Record<string, CategoryConfig>
+): CategoryConfig | undefined {
+  return userCategories?.[categoryName] ?? DEFAULT_CATEGORIES[categoryName];
+}
+
 export function createConfigHandler(deps: ConfigHandlerDeps) {
   const { ctx, pluginConfig, modelCacheState } = deps;
 
@@ -173,15 +182,50 @@ export function createConfigHandler(deps: ConfigHandlerDeps) {
           planConfigWithoutName as Record<string, unknown>
         );
         const prometheusOverride =
-          pluginConfig.agents?.["Prometheus (Planner)"];
+          pluginConfig.agents?.["Prometheus (Planner)"] as
+            | (Record<string, unknown> & { category?: string; model?: string })
+            | undefined;
         const defaultModel = config.model as string | undefined;
+
+        // Resolve full category config (model, temperature, top_p, tools, etc.)
+        // Apply all category properties when category is specified, but explicit
+        // overrides (model, temperature, etc.) will take precedence during merge
+        const categoryConfig = prometheusOverride?.category
+          ? resolveCategoryConfig(
+              prometheusOverride.category,
+              pluginConfig.categories
+            )
+          : undefined;
+
         const prometheusBase = {
-          model: defaultModel ?? "anthropic/claude-opus-4-5",
+          model:
+            prometheusOverride?.model ??
+            categoryConfig?.model ??
+            defaultModel ??
+            "anthropic/claude-opus-4-5",
           mode: "primary" as const,
           prompt: PROMETHEUS_SYSTEM_PROMPT,
           permission: PROMETHEUS_PERMISSION,
           description: `${configAgent?.plan?.description ?? "Plan agent"} (Prometheus - OhMyOpenCode)`,
           color: (configAgent?.plan?.color as string) ?? "#FF6347",
+          // Apply category properties (temperature, top_p, tools, etc.)
+          ...(categoryConfig?.temperature !== undefined
+            ? { temperature: categoryConfig.temperature }
+            : {}),
+          ...(categoryConfig?.top_p !== undefined
+            ? { top_p: categoryConfig.top_p }
+            : {}),
+          ...(categoryConfig?.maxTokens !== undefined
+            ? { maxTokens: categoryConfig.maxTokens }
+            : {}),
+          ...(categoryConfig?.tools ? { tools: categoryConfig.tools } : {}),
+          ...(categoryConfig?.thinking ? { thinking: categoryConfig.thinking } : {}),
+          ...(categoryConfig?.reasoningEffort !== undefined
+            ? { reasoningEffort: categoryConfig.reasoningEffort }
+            : {}),
+          ...(categoryConfig?.textVerbosity !== undefined
+            ? { textVerbosity: categoryConfig.textVerbosity }
+            : {}),
         };
 
         agentConfig["Prometheus (Planner)"] = prometheusOverride