fix(agents): preserve uiSelectedModel when agent override has no model

Three agent builder files used falsy checks that incorrectly nullified
uiSelectedModel when override objects existed but had no model set:

- sisyphus-agent.ts: `?.model ?` → `?.model !== undefined ?`
- atlas-agent.ts: `?.model ?` → `?.model !== undefined ?`
- general-agents.ts: `!override?.model` → `override?.model === undefined`

This caused user model selection in web mode to revert to defaults.

Fixes #2351

src/agents/builtin-agents/atlas-agent.ts

@@ -39,7 +39,7 @@ export function maybeCreateAtlasConfig(input: {
   const atlasRequirement = AGENT_MODEL_REQUIREMENTS["atlas"]
 
   const atlasResolution = applyModelResolution({
-    uiSelectedModel: orchestratorOverride?.model ? undefined : uiSelectedModel,
+    uiSelectedModel: orchestratorOverride?.model !== undefined ? undefined : uiSelectedModel,
     userModel: orchestratorOverride?.model,
     requirement: atlasRequirement,
     availableModels,

src/agents/builtin-agents/general-agents.ts

@@ -69,7 +69,7 @@ export function collectPendingBuiltinAgents(input: {
     const isPrimaryAgent = isFactory(source) && source.mode === "primary"
 
     let resolution = applyModelResolution({
-      uiSelectedModel: (isPrimaryAgent && !override?.model) ? uiSelectedModel : undefined,
+      uiSelectedModel: (isPrimaryAgent && override?.model === undefined) ? uiSelectedModel : undefined,
       userModel: override?.model,
       requirement,
       availableModels,

src/agents/builtin-agents/sisyphus-agent.ts

@@ -52,7 +52,7 @@ export function maybeCreateSisyphusConfig(input: {
   if (disabledAgents.includes("sisyphus") || !meetsSisyphusAnyModelRequirement) return undefined
 
   let sisyphusResolution = applyModelResolution({
-    uiSelectedModel: sisyphusOverride?.model ? undefined : uiSelectedModel,
+    uiSelectedModel: sisyphusOverride?.model !== undefined ? undefined : uiSelectedModel,
     userModel: sisyphusOverride?.model,
     requirement: sisyphusRequirement,
     availableModels,