Release v1.1.0: Phase 1.1 - Path Normalization & Error Handling

- Add PathUtils for cross-platform path normalization and validation
- Add ErrorMessages with context-aware, actionable error messages
- Update all tool implementations with enhanced path handling
- Improve tool descriptions for AI agents with detailed guidance
- Add Jest testing infrastructure with 43 passing tests
- Add comprehensive documentation (Tool Selection Guide, error improvements)
- Fix cross-platform path issues (Windows backslashes, case sensitivity)
- Fix delete folder error message (clear 'cannot delete folders' message)
- Fix parent folder detection with specific error messages
- All changes backward compatible with v1.0.0

New files:
- src/utils/path-utils.ts - Path normalization utilities
- src/utils/error-messages.ts - Enhanced error messages
- tests/__mocks__/obsidian.ts - Mock Obsidian API
- tests/path-utils.test.ts - 43 unit tests
- tests/README.md - Testing guide
- jest.config.js - Jest configuration
- docs/TOOL_SELECTION_GUIDE.md - Comprehensive tool guide
- docs/ERROR_MESSAGE_IMPROVEMENTS.md - Error message documentation
- docs/TOOL_DESCRIPTION_IMPROVEMENTS.md - AI agent improvements
- PHASE_1.1_IMPLEMENTATION.md - Implementation summary
- RELEASE_NOTES_v1.1.0.md - Release notes

Updated:
- CHANGELOG.md - Add v1.1.0 entry
- ROADMAP.md - Mark Phase 1.1 complete, add Phase 1.5 proposal
- manifest.json - Bump to v1.1.0
- package.json - Bump to v1.1.0, add test scripts
- src/tools/index.ts - Enhanced tool descriptions
- src/tools/note-tools.ts - Use PathUtils and ErrorMessages
- src/tools/vault-tools.ts - Use PathUtils and ErrorMessages

jest.config.js

@@ -0,0 +1,14 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/tests'],
+  testMatch: ['**/*.test.ts'],
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  collectCoverageFrom: [
+    'src/**/*.ts',
+    '!src/**/*.d.ts',
+  ],
+  moduleNameMapper: {
+    '^obsidian$': '<rootDir>/tests/__mocks__/obsidian.ts'
+  }
+};