refactor: reorganize task management imports and update task handling tools

- Updated import paths for task management providers in task-comment, task-create, and task-update tools.
- Removed deprecated task-complete and task-pickup tools, replacing them with work-finish and work-start tools for improved task handling.
- Enhanced work-finish and work-start tools to streamline task completion and pickup processes, including context-aware detection and auto-scheduling features.
- Updated package.json to include build scripts and main entry point.
- Modified tsconfig.json to enable output directory, declaration files, and source maps for better TypeScript support.

lib/providers/provider.ts

@@ -0,0 +1,45 @@
+/**
+ * IssueProvider — Abstract interface for issue tracker operations.
+ *
+ * Implementations: GitHub (gh CLI), GitLab (glab CLI).
+ */
+
+export const STATE_LABELS = [
+  "Planning", "To Do", "Doing", "To Test", "Testing", "Done", "To Improve", "Refining",
+] as const;
+
+export type StateLabel = (typeof STATE_LABELS)[number];
+
+export const LABEL_COLORS: Record<StateLabel, string> = {
+  Planning: "#6699cc", "To Do": "#428bca", Doing: "#f0ad4e", "To Test": "#5bc0de",
+  Testing: "#9b59b6", Done: "#5cb85c", "To Improve": "#d9534f", Refining: "#f39c12",
+};
+
+export type Issue = {
+  iid: number;
+  title: string;
+  description: string;
+  labels: string[];
+  state: string;
+  web_url: string;
+};
+
+export interface IssueProvider {
+  ensureLabel(name: string, color: string): Promise<void>;
+  ensureAllStateLabels(): Promise<void>;
+  createIssue(title: string, description: string, label: StateLabel, assignees?: string[]): Promise<Issue>;
+  listIssuesByLabel(label: StateLabel): Promise<Issue[]>;
+  getIssue(issueId: number): Promise<Issue>;
+  transitionLabel(issueId: number, from: StateLabel, to: StateLabel): Promise<void>;
+  closeIssue(issueId: number): Promise<void>;
+  reopenIssue(issueId: number): Promise<void>;
+  hasStateLabel(issue: Issue, expected: StateLabel): boolean;
+  getCurrentStateLabel(issue: Issue): StateLabel | null;
+  hasMergedMR(issueId: number): Promise<boolean>;
+  getMergedMRUrl(issueId: number): Promise<string | null>;
+  addComment(issueId: number, body: string): Promise<void>;
+  healthCheck(): Promise<boolean>;
+}
+
+/** @deprecated Use IssueProvider */
+export type TaskManager = IssueProvider;