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>

.mcpbignore

@@ -0,0 +1,31 @@
+# Development files
+tests/
+.git/
+node_modules/
+src/
+tsconfig.json
+jest.config.js
+
+# Build artifacts
+*.map
+*.tsbuildinfo
+
+# IDE and OS files
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db
+
+# Logs and temp files
+*.log
+*.tmp
+*.swp
+
+# Environment files
+.env
+.env.*
+
+# Documentation (keep only README in bundle)
+specs/
+.specify/
+.github/