Pattern Proposal: Lineage-Aware Architectural Delta Slicing

Summary

Transforms unstructured git diffs into structured capability records and lineage graphs prior to agent evaluation.

Candidate Pattern

• ID: lineage-aware-architectural-delta-slicing
• Classification: intelligence
• Maturity: strategic_direction
• Type: emerging

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/steering/models.py (RawGitDelta, ArchitecturalDelta, CapabilityLineage, GitChangeType) - Data models for delta and lineage decomposition.
• docs/architecture/cas-agentic-development-flow.md - Outlines flow from code modifications to architectural delta classification.

Scope Assessment

• Evidence Strength: high
• Confidence: high
• Applies to: ideas-to-life-cas

Rationale

• Intent: Provide reasoning agents with categorized functional changes rather than raw line-by-line diffs.
• Context: Triggered when evaluating pull requests or branch merges against known architectural capabilities.
• Force: Raw git diffs contain irrelevant syntactic changes (whitespace, imports) that distract the LLM.
• Force: Tracing how changes affect long-term system capabilities requires structured delta lineage.

Traceability

Artifact source: proposed-patterns