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Context fragment scoring

Keyword-overlap relevance with exponential recency decay and staleness detection.

Status: shipped | Area: policy | Published: 2026-03-20

Control impact: Improves context assembly quality by prioritizing relevant, recent fragments.

  • internal/contextasm.FragmentScorer with camelCase-aware tokenization
  • Exponential recency decay (half-life ≈ 7 days)
  • Staleness flag when source file modified after assembly
  • Score field added to SelectedFragment