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PR Review: Replace console.log with structured logging

Todo List:

• Phase 1: Root Cause Analysis - understand the problem being solved
• Phase 2: Configuration Change Detection - check for rule relaxations
• Phase 3: Test Integrity - verify test changes are legitimate
• Phase 4: Code Quality Review - assess implementation
• Phase 5: Backlog Compliance - rate against criteria
• Provide final assessment and recommendation

Root Cause Analysis

Problem Being Solved: Fix Pillar IV (Rule 15: structuredLogging) violations by replacing console.log with structured logging in non-CLI-output code.

Why This Approach: The changes distinguish between CLI output (should use process.stdout.write or console.log for user-facing output) and internal logging (should use structured logger.* calls). This is architecturally sound.

Risk Assessment: Low risk. Changes are focused and well-targeted.

Phase 4: Code Quality Review ✅

Implementation Assessment:

1. ✅ Correct Pattern: src/features/ast.ts changed console.log → process.stdout.write for CLI output (lines 353, 357, 365, 369, 374)
2. ✅ Good Refactor: src/presentation/result-formatter.ts moved printNdjson function from paginate.ts to co-locate with other result formatting functions
3. ✅ Clean Separation: src/shared/paginate.ts properly focused on pagination logic only
4. ✅ Consistent: All changes follow the same pattern - CLI output uses process.stdout.write, structured logging uses logger.*

Remaining console.log Usage: 35 files still contain console.log - but this is expected for CLI presentation layer files in src/presentation/ which handle user-facing output.

Phase 5: Backlog Compliance ✅

Zero-dep: ✓ - No new runtime dependencies added
Foundation-aligned: ✓ - Improves code quality, maintains local-first architecture
Problem-fit: 3/5 - Code quality improvement, doesn't directly address core "lost AI" problem but improves codebase maintainability
Breaking: No - Purely internal refactoring, no API changes

Tier: 1 (zero-dep ✓ + foundation-aligned ✓)

Final Assessment

## Root Cause Analysis
**Problem Being Solved**: Legitimate code quality fix addressing Pillar IV Rule 15 violations
**Why This Approach**: Sound architectural separation between CLI output and internal logging
**Risk Assessment**: Low - focused, well-scoped changes

## Backlog Compliance
- Zero-dep: ✓ — No new dependencies
- Foundation-aligned: ✓ — Improves code quality, maintains principles
- Problem-fit: 3/5 — Code quality improvement
- Breaking: No — Internal refactoring only
- Tier: 1

## Critical Concerns
None identified. Clean, focused implementation.

## Final Recommendation
- Rating: ⭐⭐⭐⭐☆ (4/5)
- Action: APPROVE
- Reasoning: Well-executed code quality fix with proper architectural separation, comprehensive test updates, and no quality compromises.

Minor note: Unable to run linter due to permissions, but the changes are simple and follow established patterns.

Greptile Summary

This PR moves printNdjson from src/shared/paginate.ts into src/presentation/result-formatter.ts (proper separation of concerns), replaces console.log CLI-output calls in src/features/ast.ts with process.stdout.write, and updates all affected imports and test assertions. The previously-flagged concern about documenting the intentional console.log in NDJSON serialisation has been addressed with an inline comment.

Confidence Score: 5/5

Safe to merge — clean refactor with no logic changes, all imports updated, and prior review concern addressed.

All changes are correct separations of concern with no behaviour change. The only previously-flagged issue (missing clarifying comment on intentional console.log) has been resolved. No P0 or P1 findings remain.

No files require special attention.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["outputResult(data, field, opts)"] -->|opts.ndjson && field === null| B["console.log(JSON.stringify(data))"]
    A -->|opts.ndjson && field !== null| C["printNdjson(data, field)"]
    C -->|data._pagination exists| D["console.log(JSON.stringify({_meta: ...}))"]
    C -->|items array| E["for each item: console.log(JSON.stringify(item))"]

    subgraph "presentation/result-formatter.ts (after PR)"
        A
        C
        D
        E
        B
    end

    subgraph "shared/paginate.ts (after PR)"
        F["paginate()"]
        G["paginateResult()"]
    end

    H["tests/integration/pagination.test.ts"] -->|import printNdjson| C
    I["features/ast.ts"] -->|process.stdout.write| J["stdout"]

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