refactor: consolidate shared packages and eliminate code duplication

- Update 26+ files to import secureFs from @automaker/platform
- Create shared type files: github.ts, worktree.ts, claude.ts in libs/types
- Create exec-utils.ts for cross-platform shell execution
- Delete redundant wrapper files: secure-fs.ts, stream-processor.ts, enhancement-prompts.ts
- Update GitHub routes to use createLogError pattern
- Add isENOENT helper to routes/common.ts
- Fix test imports to use @automaker/prompts and @automaker/platform

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

libs/types/src/claude.ts

@@ -0,0 +1,35 @@
+/**
+ * Claude Usage types for CLI-based usage tracking
+ */
+
+export interface ClaudeUsage {
+  sessionTokensUsed: number;
+  sessionLimit: number;
+  sessionPercentage: number;
+  sessionResetTime: string; // ISO date string
+  sessionResetText: string; // Raw text like "Resets 10:59am (Asia/Dubai)"
+
+  weeklyTokensUsed: number;
+  weeklyLimit: number;
+  weeklyPercentage: number;
+  weeklyResetTime: string; // ISO date string
+  weeklyResetText: string; // Raw text like "Resets Dec 22 at 7:59pm (Asia/Dubai)"
+
+  sonnetWeeklyTokensUsed: number;
+  sonnetWeeklyPercentage: number;
+  sonnetResetText: string; // Raw text like "Resets Dec 27 at 9:59am (Asia/Dubai)"
+
+  costUsed: number | null;
+  costLimit: number | null;
+  costCurrency: string | null;
+
+  lastUpdated: string; // ISO date string
+  userTimezone: string;
+}
+
+export interface ClaudeStatus {
+  indicator: {
+    color: 'green' | 'yellow' | 'orange' | 'red' | 'gray';
+  };
+  description: string;
+}

libs/types/src/github.ts

@@ -0,0 +1,59 @@
+/**
+ * GitHub-related types shared across server and UI
+ */
+
+export interface GitHubLabel {
+  name: string;
+  color: string;
+}
+
+export interface GitHubAuthor {
+  login: string;
+}
+
+export interface GitHubIssue {
+  number: number;
+  title: string;
+  state: string;
+  author: GitHubAuthor;
+  createdAt: string;
+  labels: GitHubLabel[];
+  url: string;
+  body: string;
+}
+
+export interface GitHubPR {
+  number: number;
+  title: string;
+  state: string;
+  author: GitHubAuthor;
+  createdAt: string;
+  labels: GitHubLabel[];
+  url: string;
+  isDraft: boolean;
+  headRefName: string;
+  reviewDecision: string | null;
+  mergeable: string;
+  body: string;
+}
+
+export interface GitHubRemoteStatus {
+  hasGitHubRemote: boolean;
+  remoteUrl: string | null;
+  owner: string | null;
+  repo: string | null;
+}
+
+export interface ListPRsResult {
+  success: boolean;
+  openPRs?: GitHubPR[];
+  mergedPRs?: GitHubPR[];
+  error?: string;
+}
+
+export interface ListIssuesResult {
+  success: boolean;
+  openIssues?: GitHubIssue[];
+  closedIssues?: GitHubIssue[];
+  error?: string;
+}

libs/types/src/index.ts

@@ -93,3 +93,28 @@ export type {
   TaskProgressPayload,
   PlanApprovalPayload,
 } from './planning.js';
+
+// GitHub types
+export type {
+  GitHubLabel,
+  GitHubAuthor,
+  GitHubIssue,
+  GitHubPR,
+  GitHubRemoteStatus,
+  ListPRsResult,
+  ListIssuesResult,
+} from './github.js';
+
+// Worktree types
+export type {
+  WorktreePRInfo,
+  WorktreeMetadata,
+  WorktreeListItem,
+  PRComment,
+  PRInfo,
+  DevServerInfo,
+  TrackedBranch,
+} from './worktree.js';
+
+// Claude usage types
+export type { ClaudeUsage, ClaudeStatus } from './claude.js';

libs/types/src/worktree.ts

@@ -0,0 +1,61 @@
+/**
+ * Worktree-related types shared across server and UI
+ */
+
+export interface WorktreePRInfo {
+  number: number;
+  url: string;
+  title: string;
+  state: string;
+  createdAt: string;
+}
+
+export interface WorktreeMetadata {
+  branch: string;
+  createdAt: string;
+  pr?: WorktreePRInfo;
+}
+
+export interface WorktreeListItem {
+  path: string;
+  branch: string;
+  isMain: boolean;
+  isCurrent: boolean;
+  hasWorktree: boolean;
+  hasChanges?: boolean;
+  changedFilesCount?: number;
+  pr?: WorktreePRInfo;
+}
+
+export interface PRComment {
+  id: number;
+  author: string;
+  body: string;
+  path?: string;
+  line?: number;
+  createdAt: string;
+  isReviewComment: boolean;
+}
+
+export interface PRInfo {
+  number: number;
+  title: string;
+  url: string;
+  state: string;
+  author: string;
+  body: string;
+  comments: PRComment[];
+  reviewComments: PRComment[];
+}
+
+export interface DevServerInfo {
+  worktreePath: string;
+  port: number;
+  url: string;
+}
+
+export interface TrackedBranch {
+  name: string;
+  createdAt: string;
+  lastActivatedAt?: string;
+}