feat: unit tests

[amithad]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive unit tests for the core components of the ak-py library, replacing the minimal existing test. It introduces tests for session management, runtime configuration, configuration handling, and CLI testing utilities, while also updating the CI workflow to run both unit tests and end-to-end tests.

• Adds unit tests for in-memory session store, runtime singleton pattern, and configuration loading
• Introduces CLI testing utilities with fuzzy matching capabilities
• Updates GitHub Actions workflow to include separate unit test job

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ak-py/tests/test_sessions_in_memory.py	Tests for InMemorySessionStore operations including creation, loading, and clearing
ak-py/tests/test_runtime.py	Tests for Runtime singleton pattern, agent registration, and session management
ak-py/tests/test_config.py	Tests for configuration loading from YAML files and environment variable overrides
ak-py/tests/test_cli_tester.py	Tests for CLI testing utilities with prompt handling and fuzzy matching
ak-py/tests/ak_core_test.py	Removes placeholder test file
.github/workflows/test.yaml	Updates workflow to add unit test job alongside existing CLI E2E tests

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