feat: Russian localization + dynamic agent language

apps/desktop/src/main/agent/agent-manager.ts

@@ -128,6 +128,11 @@ export class AgentManager extends EventEmitter {
     return accounts.length > 0;
   }
 
+  private getSettingsLanguage(): string | undefined {
+    const settings = readSettingsFile();
+    return settings?.language as string | undefined;
+  }
+
   /**
    * Resolve auth using the provider accounts priority queue.
    * Falls back to legacy Claude profile if no provider accounts exist.
@@ -389,6 +394,7 @@ export class AgentManager extends EventEmitter {
       maxSteps: 1000,
       specDir: resolvedSpecDir,
       projectDir: projectPath,
+      language: this.getSettingsLanguage(),
       provider: resolved.provider,
       modelId: resolved.modelId,
       apiKey: resolved.auth?.apiKey,
@@ -510,6 +516,7 @@ export class AgentManager extends EventEmitter {
       maxSteps: 1000,
       specDir: worktreeSpecDir,
       projectDir: effectiveProjectDir,
+      language: this.getSettingsLanguage(),
       // When running in a worktree, sourceSpecDir points to the main project spec dir
       // so the subtask iterator can sync phase updates in real time (not just on exit).
       sourceSpecDir: worktreePath ? specDir : undefined,
@@ -616,6 +623,7 @@ export class AgentManager extends EventEmitter {
       maxSteps: 1000,
       specDir: effectiveSpecDir,
       projectDir: effectiveProjectDir,
+      language: this.getSettingsLanguage(),
       provider: resolved.provider,
       modelId: resolved.modelId,
       apiKey: resolved.auth?.apiKey,

apps/desktop/src/main/ai/agent/types.ts

@@ -77,6 +77,8 @@ export interface SerializableSessionConfig {
   };
   /** Enable agentic orchestration mode where the AI drives the pipeline via SpawnSubagent tool */
   useAgenticOrchestration?: boolean;
+  /** UI language code for agent response language (e.g., 'en', 'ru') */
+  language?: string;
   /** Tool context serialized fields */
   toolContext: {
     cwd: string;

apps/desktop/src/main/ai/agent/worker.ts

@@ -230,6 +230,7 @@ async function assemblePrompt(
     specDir: session.specDir,
     projectDir: session.projectDir,
     projectInstructions: cachedProjectInstructions,
+    language: session.language,
   });
 }
 

apps/desktop/src/main/ai/client/factory.ts

@@ -15,6 +15,8 @@
 import type { Tool as AITool } from 'ai';
 
 import { resolveAuth, resolveAuthFromQueue, buildDefaultQueueConfig } from '../auth/resolver';
+import { readSettingsFile } from '../../settings-utils';
+import { buildLanguageInstruction } from '../prompts/language-utils';
 import {
   getDefaultThinkingLevel,
   getRequiredMcpServers,
@@ -192,6 +194,17 @@ export async function createAgentClient(
   };
 }
 
+// =============================================================================
+// Language Injection
+// =============================================================================
+
+function injectLanguageInstruction(prompt: string): string {
+  const settings = readSettingsFile();
+  const lang = (settings?.language as string | undefined) ?? 'en';
+  const instruction = buildLanguageInstruction(lang);
+  return instruction ? instruction + prompt : prompt;
+}
+
 // =============================================================================
 // createSimpleClient
 // =============================================================================
@@ -289,7 +302,7 @@ export async function createSimpleClient(
     model,
     resolvedModelId,
     tools,
-    systemPrompt,
+    systemPrompt: injectLanguageInstruction(systemPrompt),
     maxSteps,
     thinkingLevel: resolvedThinkingLevel,
     ...(queueAuth ? { queueAuth } : {}),

apps/desktop/src/main/ai/prompts/language-utils.ts

@@ -0,0 +1,11 @@
+import { AVAILABLE_LANGUAGES } from '../../../shared/constants/i18n';
+
+export function buildLanguageInstruction(language: string): string | null {
+  if (!language || language === 'en') return null;
+  const entry = AVAILABLE_LANGUAGES.find((l) => l.value === language);
+  const langName = entry?.label ?? language;
+  return (
+    `**LANGUAGE**: Always respond in ${langName}. All code comments, ` +
+    `documentation, commit messages, and explanations must be in ${langName}.\n\n`
+  );
+}

apps/desktop/src/main/ai/prompts/prompt-loader.ts

@@ -15,6 +15,7 @@ import { join } from 'node:path';
 import { execSync } from 'node:child_process';
 
 import type { ProjectCapabilities, PromptContext, PromptValidationResult } from './types';
+import { buildLanguageInstruction } from './language-utils';
 
 // =============================================================================
 // Expected prompt files (used for startup validation)
@@ -223,7 +224,13 @@ export function injectContext(promptTemplate: string, context: PromptContext): s
     sections.push(context.recoveryContext);
   }
 
-  // 3. Human input
+  // 3. Language instruction (non-English only)
+  if (context.language) {
+    const instruction = buildLanguageInstruction(context.language);
+    if (instruction) sections.push(instruction);
+  }
+
+  // 4. Human input
   if (context.humanInput) {
     sections.push(
       `## HUMAN INPUT (READ THIS FIRST!)\n\n` +
@@ -234,7 +241,7 @@ export function injectContext(promptTemplate: string, context: PromptContext): s
     );
   }
 
-  // 4. Project instructions (AGENTS.md or CLAUDE.md fallback)
+  // 5. Project instructions (AGENTS.md or CLAUDE.md fallback)
   if (context.projectInstructions) {
     sections.push(
       `## PROJECT INSTRUCTIONS\n\n` +
@@ -243,7 +250,7 @@ export function injectContext(promptTemplate: string, context: PromptContext): s
     );
   }
 
-  // 5. Base prompt
+  // 6. Base prompt
   sections.push(promptTemplate);
 
   return sections.join('');

apps/desktop/src/main/ai/prompts/types.ts

@@ -32,6 +32,8 @@ export interface PromptContext {
   recoveryHints?: string[];
   /** Phase-specific planning retry context */
   planningRetryContext?: string;
+  /** UI language code for agent response language (e.g., 'en', 'ru') */
+  language?: string;
 }
 
 // =============================================================================

apps/desktop/src/shared/constants/i18n.ts

@@ -3,11 +3,12 @@
  * Available languages and display labels
  */
 
-export type SupportedLanguage = 'en' | 'fr';
+export type SupportedLanguage = 'en' | 'fr' | 'ru';
 
 export const AVAILABLE_LANGUAGES = [
   { value: 'en' as const, label: 'English', nativeLabel: 'English' },
-  { value: 'fr' as const, label: 'French', nativeLabel: 'Français' }
+  { value: 'fr' as const, label: 'French', nativeLabel: 'Français' },
+  { value: 'ru' as const, label: 'Russian', nativeLabel: 'Русский' }
 ] as const;
 
 export const DEFAULT_LANGUAGE: SupportedLanguage = 'en';

apps/desktop/src/shared/i18n/index.ts

@@ -27,6 +27,19 @@ import frTaskReview from './locales/fr/taskReview.json';
 import frTerminal from './locales/fr/terminal.json';
 import frErrors from './locales/fr/errors.json';
 
+// Import Russian translation resources
+import ruCommon from './locales/ru/common.json';
+import ruNavigation from './locales/ru/navigation.json';
+import ruSettings from './locales/ru/settings.json';
+import ruTasks from './locales/ru/tasks.json';
+import ruWelcome from './locales/ru/welcome.json';
+import ruOnboarding from './locales/ru/onboarding.json';
+import ruDialogs from './locales/ru/dialogs.json';
+import ruGitlab from './locales/ru/gitlab.json';
+import ruTaskReview from './locales/ru/taskReview.json';
+import ruTerminal from './locales/ru/terminal.json';
+import ruErrors from './locales/ru/errors.json';
+
 export const defaultNS = 'common';
 
 export const resources = {
@@ -55,6 +68,19 @@ export const resources = {
     taskReview: frTaskReview,
     terminal: frTerminal,
     errors: frErrors
+  },
+  ru: {
+    common: ruCommon,
+    navigation: ruNavigation,
+    settings: ruSettings,
+    tasks: ruTasks,
+    welcome: ruWelcome,
+    onboarding: ruOnboarding,
+    dialogs: ruDialogs,
+    gitlab: ruGitlab,
+    taskReview: ruTaskReview,
+    terminal: ruTerminal,
+    errors: ruErrors
   }
 } as const;