docs(api): add missing functions to API documentation

- Add if_ci() to CI utilities
- Add strip_common_prefix() to path utilities
- Add detect_packages_from_files() and find_all_packages_under_path() to module detection
- Add runtime utilities: find_shiv(), ensure_standalone_script_up_to_date(), ensure_zipapp_up_to_date(), runtime_swap()
- Add subprocess utilities: run_with_output(), run_with_separated_output()
- Add create_version_info() to version utilities
- Add testing utilities: create_mock_superclass_test(), patch_everywhere()
- Update Quick Reference table with all new functions
- Update README and index.md features sections

Author: InertSloth

README.md

@@ -56,9 +56,13 @@ For installation guides, API reference, examples, and more, visit our documentat
 - 📁 **File loading** — Load TOML and JSONC files with comment support
 - 🛤️ **Path utilities** — Cross-platform path normalization and glob handling
 - 🔍 **Pattern matching** — Portable glob pattern matching with recursive `**` support
+- 🧩 **Module detection** — Detect Python packages from file paths
 - 🧪 **System detection** — Detect CI environments, pytest execution, and runtime modes
+- ⚙️ **Runtime utilities** — Build and test utilities for standalone scripts and zipapps
+- 🔧 **Subprocess utilities** — Capture and forward subprocess output
 - 📝 **Text processing** — Pluralization and error message cleanup utilities
 - 🔧 **Type utilities** — Safe isinstance checks for TypedDicts and generics
+- 🧪 **Testing utilities** — Helpers for testing mixins and patching functions
 - 🎯 **CLI-friendly** — Designed with command-line applications in mind
 
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