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This PR keeps compaction context-layout test coverage separate from runtime compaction behavior changes, so runtime logic review can stay focused. ## Included - Adds reusable context snapshot helpers in `core/tests/common/context_snapshot.rs` for rendering model-visible request/history shapes. - Standardizes helper naming for readability: - `format_request_input_snapshot` - `format_response_items_snapshot` - `format_labeled_requests_snapshot` - `format_labeled_items_snapshot` - Expands snapshot coverage for both local and remote compaction flows: - pre-turn auto-compaction - pre-turn failure/context-window-exceeded paths - mid-turn continuation compaction - manual `/compact` with and without prior user turns - Captures both sides where relevant: - compaction request shape - post-compaction history layout shape - Adds/uses shared request-inspection helpers so assertions target structured request content instead of ad-hoc JSON string parsing. - Aligns snapshots/assertions to current behavior and leaves explicit `TODO(ccunningham)` notes where behavior is known and intentionally deferred. ## Not Included - No runtime compaction logic changes. - No model-visible context/state behavior changes.