# Compact Status - 2025-11-28

**Focus**: Tech debt cleanup - DRY utilities, performance optimizations, documentation fixes

**Key Accomplishments**:
1. Added `operationErrorHandler()` and `emitEvent()` utilities to reduce boilerplate (Issues #18, #19)
2. Implemented parallel dependency validation with `Promise.all()` (Issue #14)
3. Added transitive query memoization with ~90% performance improvement (Issue #15)

**Critical Decisions**:
1. **Parallel validation is safe** - Each cycle check uses deep-copied temp graph (read-only)
2. **Cache invalidation before mutation** - Ensures current graph state for determining affected nodes
3. **Type cast exception** - `emitEvent` uses `as any` due to EventBus type inference limitations

**Next Priority Actions**:
1. Review and merge PR #33
2. Close issues #14, #15, #18, #19 after merge
3. Update Tech Debt Backlog (#31)

**Critical Issues**:
- None blocking

**Key Files Modified**:
1. `src/core/dependency-graph.ts` - Transitive query caching
2. `src/core/errors.ts` - operationErrorHandler utility
3. `src/core/events/handlers.ts` - emitEvent helper
4. `src/services/handlers/dependency-handler.ts` - Parallel validation
5. `tests/fixtures/test-doubles.ts` - TestResourceMonitor interface fix

**Context Notes**:
All 8 tasks completed. PR #33 created and ready for review. The session addressed accumulated tech debt before v0.3.1 release. Key insight: parallel validation works because `wouldCreateCycle()` is a pure read-only operation on a deep-copied temp graph.

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*Quick summary of [full status](./../2025-11-28_2210.md)*
