Implemented SkeletonCompressorService for ACMS context inheritance, producing
compressed context representations for propagation from parent plans to child
plans. Key design decisions and implementation details:
- SkeletonMetadata (frozen Pydantic model): records ratio, original_tokens,
compressed_tokens, and source_decision_ids for full auditability of each
compression pass. Persisted on Plan.skeleton_metadata.
- SkeletonCompressorService: stateless service accepting a list of
ContextFragment objects and a skeleton_ratio in [0.0, 1.0]. Fragments are
sorted by relevance descending with a stable secondary sort on fragment_id
to guarantee deterministic output. Token budget is original_tokens*(1-ratio);
fragments are greedily selected until budget is exhausted.
- Ratio semantics: 0.0 = no compression (pass-through), 1.0 = maximum
compression (single top fragment only), None = default 0.3.
- Integration: Plan model gains optional skeleton_metadata field exposed in
as_cli_dict() under the 'skeleton' key. Service registered in DI container
as skeleton_compressor_service (Singleton, stateless).
- Tests: 22 BDD scenarios (features/skeleton_compressor.feature) covering
ratio validation, stable ordering, metadata correctness, edge cases, and
plan model integration. 6 Robot Framework smoke tests. ASV benchmark suites
at 10/100/1000 fragment scales.
- Documentation: docs/reference/skeleton_compressor.md with ratio table,
algorithm description, metadata schema, and multi-decision plan example.
ISSUES CLOSED: #194
