feat: implement Obsidian MCP Bundle MVP (Phase 1-3)

- Complete project setup with TypeScript, Jest, MCPB manifest
- Implement foundational infrastructure (CLI executor, logger, error handler)
- Add 9 file operation tools for User Story 1
- Full MCP protocol compliance with stdio transport
- Input validation and sanitization for security
- Comprehensive error handling with actionable messages
- Constitutional compliance: all 6 principles satisfied

MVP includes:
- obsidian_create_note, read, append, prepend, delete, move, rename, open, file_info
- Zod validation schemas for all parameters
- 30s timeout configuration with per-command overrides
- Stderr-only logging with sanitized output
- Graceful shutdown handling

Build: ✅ 0 errors, 0 vulnerabilities
Tasks: 48/167 complete (MVP milestone)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/utils/types.ts

@@ -0,0 +1,167 @@
+/**
+ * Core TypeScript type definitions for Obsidian MCP Bundle
+ * Defines types for tool inputs, outputs, errors, and internal data structures
+ */
+
+import { z } from 'zod';
+
+/**
+ * Base tool input type - all tools receive parameters as an object
+ */
+export interface ToolInput {
+  [key: string]: unknown;
+}
+
+/**
+ * Successful tool output
+ */
+export interface ToolOutput {
+  content: Array<{
+    type: 'text';
+    text: string;
+  }>;
+  isError?: false;
+}
+
+/**
+ * Error response conforming to MCP error format
+ */
+export interface ErrorResponse {
+  content: Array<{
+    type: 'text';
+    text: string;
+  }>;
+  isError: true;
+}
+
+/**
+ * MCP error codes mapping
+ */
+export enum MCPErrorCode {
+  InvalidParams = -32602,
+  InternalError = -32603,
+  ParseError = -32700,
+  InvalidRequest = -32600,
+  MethodNotFound = -32601,
+}
+
+/**
+ * Custom error types for Obsidian operations
+ */
+export enum ObsidianErrorType {
+  FILE_NOT_FOUND = 'FILE_NOT_FOUND',
+  VAULT_NOT_FOUND = 'VAULT_NOT_FOUND',
+  OBSIDIAN_NOT_RUNNING = 'OBSIDIAN_NOT_RUNNING',
+  AMBIGUOUS_NAME = 'AMBIGUOUS_NAME',
+  CLI_TIMEOUT = 'CLI_TIMEOUT',
+  CLI_ERROR = 'CLI_ERROR',
+  VALIDATION_ERROR = 'VALIDATION_ERROR',
+}
+
+/**
+ * CLI execution result
+ */
+export interface CLIResult {
+  stdout: string;
+  stderr: string;
+  exitCode: number;
+  timedOut?: boolean;
+}
+
+/**
+ * CLI command configuration
+ */
+export interface CLICommand {
+  command: string;
+  args: string[];
+  timeout?: number;
+  cwd?: string;
+}
+
+/**
+ * Vault configuration from environment
+ */
+export interface VaultConfig {
+  vaultName: string;
+}
+
+/**
+ * Note metadata
+ */
+export interface NoteMetadata {
+  path: string;
+  name: string;
+  folder?: string;
+  size?: number;
+  created?: string;
+  modified?: string;
+  tags?: string[];
+  properties?: Record<string, unknown>;
+}
+
+/**
+ * Search result
+ */
+export interface SearchResult {
+  file: string;
+  matches?: Array<{
+    line: number;
+    text: string;
+  }>;
+}
+
+/**
+ * Task item
+ */
+export interface TaskItem {
+  id?: string;
+  text: string;
+  completed: boolean;
+  line?: number;
+  file?: string;
+}
+
+/**
+ * Link reference
+ */
+export interface LinkReference {
+  source: string;
+  target: string;
+  type: 'wikilink' | 'markdown' | 'embed';
+}
+
+/**
+ * Property definition
+ */
+export interface PropertyDefinition {
+  key: string;
+  value: unknown;
+  type: 'text' | 'number' | 'boolean' | 'date' | 'list' | 'object';
+}
+
+/**
+ * Tool definition for MCP protocol
+ */
+export interface ToolDefinition {
+  name: string;
+  description: string;
+  inputSchema: z.ZodObject<any>;
+}
+
+/**
+ * Logger interface
+ */
+export interface Logger {
+  info(message: string, ...args: unknown[]): void;
+  warn(message: string, ...args: unknown[]): void;
+  error(message: string, ...args: unknown[]): void;
+  debug(message: string, ...args: unknown[]): void;
+}
+
+/**
+ * Timeout configuration
+ */
+export interface TimeoutConfig {
+  default: number;
+  perCommand: Record<string, number>;
+}