refactor: rename atlas agent to Atlas for naming consistency

- Rename agent name from 'atlas' to 'Atlas' (PascalCase like Sisyphus, Metis, Momus)
- Add migration for lowercase 'atlas' -> 'Atlas' for backward compatibility
- Keep hook name as 'atlas' (lowercase) to match other hook naming conventions
- Update all references in types, schema, hooks, commands, and tests

src/agents/types.ts

@@ -64,7 +64,7 @@ export type BuiltinAgentName =
   | "multimodal-looker"
   | "Metis (Plan Consultant)"
   | "Momus (Plan Reviewer)"
-  | "atlas"
+  | "Atlas"
 
 export type OverridableAgentName =
   | "build"

src/agents/utils.ts

@@ -25,9 +25,9 @@ const agentSources: Record<BuiltinAgentName, AgentSource> = {
   "multimodal-looker": createMultimodalLookerAgent,
   "Metis (Plan Consultant)": createMetisAgent,
   "Momus (Plan Reviewer)": createMomusAgent,
-  // Note: atlas is handled specially in createBuiltinAgents()
+  // Note: Atlas is handled specially in createBuiltinAgents()
   // because it needs OrchestratorContext, not just a model string
-  atlas: createAtlasAgent as unknown as AgentFactory,
+  Atlas: createAtlasAgent as unknown as AgentFactory,
 }
 
 /**
@@ -166,7 +166,7 @@ export function createBuiltinAgents(
     const agentName = name as BuiltinAgentName
 
     if (agentName === "Sisyphus") continue
-    if (agentName === "atlas") continue
+    if (agentName === "Atlas") continue
     if (disabledAgents.includes(agentName)) continue
 
     const override = agentOverrides[agentName]
@@ -219,8 +219,8 @@ export function createBuiltinAgents(
     result["Sisyphus"] = sisyphusConfig
   }
 
-  if (!disabledAgents.includes("atlas")) {
-    const orchestratorOverride = agentOverrides["atlas"]
+  if (!disabledAgents.includes("Atlas")) {
+    const orchestratorOverride = agentOverrides["Atlas"]
     const orchestratorModel = orchestratorOverride?.model ?? systemDefaultModel
      let orchestratorConfig = createAtlasAgent({
        model: orchestratorModel,
@@ -233,7 +233,7 @@ export function createBuiltinAgents(
       orchestratorConfig = mergeAgentConfig(orchestratorConfig, orchestratorOverride)
     }
 
-    result["atlas"] = orchestratorConfig
+    result["Atlas"] = orchestratorConfig
   }
 
   return result