refactor: split types.ts into domain modules (phase 4, step 1)

Split 1,443-line types.ts into 14 focused domain files under src/types/:
common.ts, session.ts, task.ts, app-state.ts, respawn.ts, ralph.ts,
api.ts, lifecycle.ts, run-summary.ts, tools.ts, teams.ts, push.ts,
plan.ts, and index.ts barrel.

Moved PlanItem interface from plan-orchestrator.ts into types/plan.ts
to break circular dependency. Original types.ts replaced with barrel
re-export — zero changes to 36 import sites.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/types/session.ts

@@ -0,0 +1,136 @@
+/**
+ * @fileoverview Session type definitions
+ */
+
+import type { RespawnConfig } from './respawn.js';
+
+/** Status of a Claude session */
+export type SessionStatus = 'idle' | 'busy' | 'stopped' | 'error';
+
+/**
+ * Claude CLI startup permission mode.
+ * - `'dangerously-skip-permissions'`: Bypass all permission prompts (default)
+ * - `'normal'`: Standard mode with permission prompts
+ * - `'allowedTools'`: Only allow specific tools (requires allowedTools list)
+ */
+export type ClaudeMode = 'dangerously-skip-permissions' | 'normal' | 'allowedTools';
+
+/** Session mode: which CLI backend a session runs */
+export type SessionMode = 'claude' | 'shell' | 'opencode';
+
+/** OpenCode session configuration */
+export interface OpenCodeConfig {
+  /** Model identifier (e.g., "anthropic/claude-sonnet-4-5", "openai/gpt-5.2", "ollama/codellama") */
+  model?: string;
+  /** Whether to auto-allow all tool executions (sets permission.* = allow) */
+  autoAllowTools?: boolean;
+  /** Session ID to continue from */
+  continueSession?: string;
+  /** Whether to fork when continuing (branch the conversation) */
+  forkSession?: boolean;
+  /** Custom inline config JSON (passed via OPENCODE_CONFIG_CONTENT) */
+  configContent?: string;
+}
+
+/**
+ * Configuration for creating a new session
+ */
+export interface SessionConfig {
+  /** Unique session identifier */
+  id: string;
+  /** Working directory for the session */
+  workingDir: string;
+  /** Timestamp when session was created */
+  createdAt: number;
+}
+
+/**
+ * Available session colors for visual differentiation
+ */
+export type SessionColor = 'default' | 'red' | 'orange' | 'yellow' | 'green' | 'blue' | 'purple' | 'pink';
+
+/**
+ * Current state of a session
+ */
+export interface SessionState {
+  /** Unique session identifier */
+  id: string;
+  /** Process ID of the PTY process, null if not running */
+  pid: number | null;
+  /** Current session status */
+  status: SessionStatus;
+  /** Working directory path */
+  workingDir: string;
+  /** ID of currently assigned task, null if none */
+  currentTaskId: string | null;
+  /** Timestamp when session was created */
+  createdAt: number;
+  /** Timestamp of last activity */
+  lastActivityAt: number;
+  /** Session display name */
+  name?: string;
+  /** Session mode */
+  mode?: SessionMode;
+  /** Auto-clear enabled */
+  autoClearEnabled?: boolean;
+  /** Auto-clear token threshold */
+  autoClearThreshold?: number;
+  /** Auto-compact enabled */
+  autoCompactEnabled?: boolean;
+  /** Auto-compact token threshold */
+  autoCompactThreshold?: number;
+  /** Auto-compact prompt */
+  autoCompactPrompt?: string;
+  /** Image watcher enabled for this session */
+  imageWatcherEnabled?: boolean;
+  /** Total cost in USD */
+  totalCost?: number;
+  /** Input tokens used */
+  inputTokens?: number;
+  /** Output tokens used */
+  outputTokens?: number;
+  /** Whether respawn controller is currently enabled/running */
+  respawnEnabled?: boolean;
+  /** Respawn controller config (if enabled) */
+  respawnConfig?: RespawnConfig & { durationMinutes?: number };
+  /** Ralph / Todo tracker enabled */
+  ralphEnabled?: boolean;
+  /** Ralph auto-enable disabled (user explicitly turned off Ralph) */
+  ralphAutoEnableDisabled?: boolean;
+  /** Ralph completion phrase (if set) */
+  ralphCompletionPhrase?: string;
+  /** Parent agent ID if this session is a spawned agent */
+  parentAgentId?: string;
+  /** Child agent IDs spawned by this session */
+  childAgentIds?: string[];
+  /** Nice priority enabled */
+  niceEnabled?: boolean;
+  /** Nice value (-20 to 19) */
+  niceValue?: number;
+  /** User-assigned color for visual differentiation */
+  color?: SessionColor;
+  /** Flicker filter enabled (buffers output after screen clears) */
+  flickerFilterEnabled?: boolean;
+  /** Claude Code CLI version (parsed from terminal, e.g., "2.1.27") */
+  cliVersion?: string;
+  /** Claude model in use (parsed from terminal, e.g., "Opus 4.5") */
+  cliModel?: string;
+  /** Account type (parsed from terminal, e.g., "Claude Max", "API") */
+  cliAccountType?: string;
+  /** Latest CLI version available (parsed from version check) */
+  cliLatestVersion?: string;
+  /** OpenCode-specific configuration (only for mode === 'opencode') */
+  openCodeConfig?: OpenCodeConfig;
+}
+
+/**
+ * Output captured from a session
+ */
+export interface SessionOutput {
+  /** Standard output content */
+  stdout: string;
+  /** Standard error content */
+  stderr: string;
+  /** Exit code of the process, null if still running */
+  exitCode: number | null;
+}