feat(agents): wire Gemini prompt routing into Sisyphus-Junior, Atlas, Prometheus

Add 'gemini' to prompt source types and route Gemini models to new
Gemini-optimized prompts via isGeminiModel detection. Update barrel
exports for all 3 agent modules. All existing tests pass.

src/agents/atlas/agent.ts

@@ -6,12 +6,13 @@
  *
  * Routing:
  * 1. GPT models (openai/*, github-copilot/gpt-*) → gpt.ts (GPT-5.2 optimized)
- * 2. Default (Claude, etc.) → default.ts (Claude-optimized)
+ * 2. Gemini models (google/*, google-vertex/*) → gemini.ts (Gemini-optimized)
+ * 3. Default (Claude, etc.) → default.ts (Claude-optimized)
  */
 
 import type { AgentConfig } from "@opencode-ai/sdk"
 import type { AgentMode, AgentPromptMetadata } from "../types"
-import { isGptModel } from "../types"
+import { isGptModel, isGeminiModel } from "../types"
 import type { AvailableAgent, AvailableSkill, AvailableCategory } from "../dynamic-agent-prompt-builder"
 import { buildCategorySkillsDelegationGuide } from "../dynamic-agent-prompt-builder"
 import type { CategoryConfig } from "../../config/schema"
@@ -20,6 +21,7 @@ import { createAgentToolRestrictions } from "../../shared/permission-compat"
 
 import { getDefaultAtlasPrompt } from "./default"
 import { getGptAtlasPrompt } from "./gpt"
+import { getGeminiAtlasPrompt } from "./gemini"
 import {
   getCategoryDescription,
   buildAgentSelectionSection,
@@ -30,7 +32,7 @@ import {
 
 const MODE: AgentMode = "primary"
 
-export type AtlasPromptSource = "default" | "gpt"
+export type AtlasPromptSource = "default" | "gpt" | "gemini"
 
 /**
  * Determines which Atlas prompt to use based on model.
@@ -39,6 +41,9 @@ export function getAtlasPromptSource(model?: string): AtlasPromptSource {
   if (model && isGptModel(model)) {
     return "gpt"
   }
+  if (model && isGeminiModel(model)) {
+    return "gemini"
+  }
   return "default"
 }
 
@@ -58,6 +63,8 @@ export function getAtlasPrompt(model?: string): string {
   switch (source) {
     case "gpt":
       return getGptAtlasPrompt()
+    case "gemini":
+      return getGeminiAtlasPrompt()
     case "default":
     default:
       return getDefaultAtlasPrompt()

src/agents/atlas/index.ts

@@ -1,5 +1,6 @@
 export { ATLAS_SYSTEM_PROMPT, getDefaultAtlasPrompt } from "./default"
 export { ATLAS_GPT_SYSTEM_PROMPT, getGptAtlasPrompt } from "./gpt"
+export { ATLAS_GEMINI_SYSTEM_PROMPT, getGeminiAtlasPrompt } from "./gemini"
 export {
   getCategoryDescription,
   buildAgentSelectionSection,

src/agents/prometheus/index.ts

@@ -6,6 +6,7 @@ export {
 } from "./system-prompt"
 export type { PrometheusPromptSource } from "./system-prompt"
 export { PROMETHEUS_GPT_SYSTEM_PROMPT, getGptPrometheusPrompt } from "./gpt"
+export { PROMETHEUS_GEMINI_SYSTEM_PROMPT, getGeminiPrometheusPrompt } from "./gemini"
 
 // Re-export individual sections for granular access
 export { PROMETHEUS_IDENTITY_CONSTRAINTS } from "./identity-constraints"

src/agents/prometheus/system-prompt.ts

@@ -5,7 +5,8 @@ import { PROMETHEUS_HIGH_ACCURACY_MODE } from "./high-accuracy-mode"
 import { PROMETHEUS_PLAN_TEMPLATE } from "./plan-template"
 import { PROMETHEUS_BEHAVIORAL_SUMMARY } from "./behavioral-summary"
 import { getGptPrometheusPrompt } from "./gpt"
-import { isGptModel } from "../types"
+import { getGeminiPrometheusPrompt } from "./gemini"
+import { isGptModel, isGeminiModel } from "../types"
 
 /**
  * Combined Prometheus system prompt (Claude-optimized, default).
@@ -30,7 +31,7 @@ export const PROMETHEUS_PERMISSION = {
   question: "allow" as const,
 }
 
-export type PrometheusPromptSource = "default" | "gpt"
+export type PrometheusPromptSource = "default" | "gpt" | "gemini"
 
 /**
  * Determines which Prometheus prompt to use based on model.
@@ -39,12 +40,16 @@ export function getPrometheusPromptSource(model?: string): PrometheusPromptSourc
   if (model && isGptModel(model)) {
     return "gpt"
   }
+  if (model && isGeminiModel(model)) {
+    return "gemini"
+  }
   return "default"
 }
 
 /**
  * Gets the appropriate Prometheus prompt based on model.
  * GPT models → GPT-5.2 optimized prompt (XML-tagged, principle-driven)
+ * Gemini models → Gemini-optimized prompt (aggressive tool-call enforcement, thinking checkpoints)
  * Default (Claude, etc.) → Claude-optimized prompt (modular sections)
  */
 export function getPrometheusPrompt(model?: string): string {
@@ -53,6 +58,8 @@ export function getPrometheusPrompt(model?: string): string {
   switch (source) {
     case "gpt":
       return getGptPrometheusPrompt()
+    case "gemini":
+      return getGeminiPrometheusPrompt()
     case "default":
     default:
       return PROMETHEUS_SYSTEM_PROMPT

src/agents/sisyphus-junior/agent.ts

@@ -6,12 +6,13 @@
  *
  * Routing:
  * 1. GPT models (openai/*, github-copilot/gpt-*) -> gpt.ts (GPT-5.2 optimized)
- * 2. Default (Claude, etc.) -> default.ts (Claude-optimized)
+ * 2. Gemini models (google/*, google-vertex/*) -> gemini.ts (Gemini-optimized)
+ * 3. Default (Claude, etc.) -> default.ts (Claude-optimized)
  */
 
 import type { AgentConfig } from "@opencode-ai/sdk"
 import type { AgentMode } from "../types"
-import { isGptModel } from "../types"
+import { isGptModel, isGeminiModel } from "../types"
 import type { AgentOverrideConfig } from "../../config/schema"
 import {
   createAgentToolRestrictions,
@@ -20,6 +21,7 @@ import {
 
 import { buildDefaultSisyphusJuniorPrompt } from "./default"
 import { buildGptSisyphusJuniorPrompt } from "./gpt"
+import { buildGeminiSisyphusJuniorPrompt } from "./gemini"
 
 const MODE: AgentMode = "subagent"
 
@@ -32,7 +34,7 @@ export const SISYPHUS_JUNIOR_DEFAULTS = {
   temperature: 0.1,
 } as const
 
-export type SisyphusJuniorPromptSource = "default" | "gpt"
+export type SisyphusJuniorPromptSource = "default" | "gpt" | "gemini"
 
 /**
  * Determines which Sisyphus-Junior prompt to use based on model.
@@ -41,6 +43,9 @@ export function getSisyphusJuniorPromptSource(model?: string): SisyphusJuniorPro
   if (model && isGptModel(model)) {
     return "gpt"
   }
+  if (model && isGeminiModel(model)) {
+    return "gemini"
+  }
   return "default"
 }
 
@@ -57,6 +62,8 @@ export function buildSisyphusJuniorPrompt(
   switch (source) {
     case "gpt":
       return buildGptSisyphusJuniorPrompt(useTaskSystem, promptAppend)
+    case "gemini":
+      return buildGeminiSisyphusJuniorPrompt(useTaskSystem, promptAppend)
     case "default":
     default:
       return buildDefaultSisyphusJuniorPrompt(useTaskSystem, promptAppend)

src/agents/sisyphus-junior/index.ts

@@ -1,5 +1,6 @@
 export { buildDefaultSisyphusJuniorPrompt } from "./default"
 export { buildGptSisyphusJuniorPrompt } from "./gpt"
+export { buildGeminiSisyphusJuniorPrompt } from "./gemini"
 
 export {
   SISYPHUS_JUNIOR_DEFAULTS,