The SlidingWindowStrategy class was implemented but not exported from the services package __init__.py, making it inaccessible to consumers. This fix adds the necessary import and lazy-load entry to make the strategy available for use in the ACMS pipeline.
Implements SlidingWindowStrategy class that satisfies the ContextStrategy
protocol for the ACMS pipeline. The strategy limits token usage by keeping
only the most recent N messages or tokens in context, which is critical for
long-running agent sessions that would otherwise exceed LLM context limits.
Key features:
- Configurable window_size (int) and window_mode ('messages' | 'tokens')
- Messages mode: keeps the most recent window_size non-system fragments
- Tokens mode: keeps the most recent fragments within the token budget
- System prompt preservation: fragments with role='system' are always kept
- Registered in the plugin registry under key 'sliding_window'
- Input validation: window_size must be positive, window_mode must be valid
- Full BDD test coverage with 22 scenarios across all acceptance criteria
ISSUES CLOSED: #9995
HAL9000