test(install): add 14 comprehensive installation tests

- Add test_installation.bats with full coverage of install.sh
- Tests cover directory creation, command installation, permissions
- Template and lib file copying verification
- Dependency detection with mocked failures (jq, git, node)
- PATH detection and warning system tests
- Uninstallation cleanup verification
- Idempotency testing (run twice without errors)
- End-to-end installation workflow validation
- All tests use isolated temp directories for safety
- Update CLAUDE.md with new test count (165 total)
- Fix npm test script to run tests recursively
- Version bump to v0.9.3

package.json

@@ -9,7 +9,7 @@
     "test": "tests"
   },
   "scripts": {
-    "test": "bats tests/",
+    "test": "bats tests/unit/ tests/integration/",
     "test:unit": "bats tests/unit/",
     "test:integration": "bats tests/integration/",
     "test:e2e": "bats tests/e2e/"