Add UpdateKind/LoopUpdateSummary types for loop update pattern analysis.
Currently uses carrier name heuristics internally (same as 170-C-1),
but provides clean interface for future AST/MIR-based analysis.
New types:
- UpdateKind: CounterLike | AccumulationLike | Other
- CarrierUpdateInfo: name + kind pair
- LoopUpdateSummary: collection with helper methods
Helper methods:
- has_single_counter(): for StringExamination detection
- has_accumulation(): for ArrayAccumulation detection
Design doc: docs/development/current/main/phase170-c2-update-summary-design.md
- Describes LoopFeatures.update_summary integration plan
- Migration path to AST/MIR analysis
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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