chore: lazy-load node:os in builder, remove dogfooding guide

[carlos-alm]

Summary

• Lazy-load node:os in builder.js — the sole os.tmpdir() call is now behind a dynamic import, so the entire post-build registry block uses only lazy-loaded deps
• Delete docs/dogfooding-guide.md — all 7 action items are resolved (Bump actions/setup-node from 4 to 6 #1 parser split, Bump actions/github-script from 7 to 8 #3 builder fan-out, Bump tree-sitter-javascript from 0.23.1 to 0.25.0 #4 watcher reviewed, Bump better-sqlite3 from 11.10.0 to 12.6.2 #5 diff-impact git guard, Bump commander from 12.1.0 to 14.0.3 #6 stats command, Bump tree-sitter-python from 0.23.6 to 0.25.0 #7 embed exercise)
• No changes to watcher.js — all imports are essential for the hot path

Test plan

• All 463 tests pass (npm test)
• codegraph build . succeeds (530 nodes, 318 edges)
• codegraph stats reports 82/100 quality score
• No conflict with WASM boundary crossing optimization (d4ef6da)

[claude]

Claude finished @carlos-alm's task —— View job

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PR Review Complete

Reviewing PR #68: "chore: lazy-load node:os in builder, remove dogfooding guide"

Todo List

• Phase 1: Root cause analysis - understand the problem being solved
• Phase 2: Configuration change detection - check for high-risk changes
• Phase 3: Test integrity - look for red flags in tests
• Phase 4: Code quality review - analyze the actual changes
• Provide final assessment with rating and recommendation

Phase 1: Root Cause Analysis ✅

Problem Being Solved: This PR addresses performance/startup optimization by lazy-loading the node:os module in builder.js. The only usage of os.tmpdir() is in the post-build registry logic (lines 832-844), which is gated behind !opts.skipRegistry. By lazy-loading this import, the entire post-build registry block now uses only lazy-loaded dependencies.

Why This Approach: The PR description mentions this is part of a larger "WASM boundary crossing optimization" effort. Lazy-loading non-essential modules improves startup performance, especially important for CLI tools that may not always need every dependency.

Secondary Change: The dogfooding guide deletion appears to be legitimate cleanup - all 7 action items from the guide have been resolved according to the PR description.

Risk Assessment: This is a low-risk performance optimization. The lazy-loading is correctly implemented using dynamic import and the functionality remains unchanged.

Phase 2: Configuration Change Detection ✅

✅ NO HIGH-RISK CHANGES FOUND

• No biome/linting rule modifications
• No test timeout or coverage threshold changes
• No build configuration alterations
• No TypeScript strict mode changes
• The changes are purely runtime performance optimizations

Phase 3: Test Integrity ✅

✅ TESTS APPEAR SOUND

The test changes in tests/unit/builder.test.js were added in a separate earlier commit (5ae1cde) and are not part of this PR. The current PR only touches src/builder.js and deletes docs/dogfooding-guide.md.

• No weakened assertions
• No test coverage gaps introduced
• Test plan shows all 463 tests pass
• No suspicious test modifications alongside code changes

Phase 4: Code Quality Review ✅

✅ EXCELLENT CODE QUALITY

src/builder.js:832-834 changes:

• ✅ Correct lazy-loading pattern: const { tmpdir } = await import('node:os') is the proper way to lazy-load a single export
• ✅ Appropriate placement: The dynamic import is correctly placed just before usage, minimizing the time between import and use
• ✅ Functionality preserved: tmpdir() call behaves identically to the previous os.tmpdir() call
• ✅ Performance improvement: Eliminates an import that's only needed in post-build registry logic (optional path)
• ✅ No breaking changes: API surface and behavior remain identical

Documentation cleanup:

• ✅ Legitimate deletion: All 7 dogfooding guide action items have been resolved according to the commit message
• ✅ Proper justification: The guide served its purpose and is no longer needed
• ✅ Clean git history: File deletion is tracked properly

Minor Observations

Strengths:

• Micro-optimization that improves CLI startup time without affecting functionality
• Consistent with the project's pattern of lazy-loading optional dependencies (structure.js, registry.js)
• Clear, focused commit with single responsibility

No concerns identified.

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Final Assessment

Root Cause Analysis

Problem Being Solved: Performance optimization - lazy-loading node:os import to reduce CLI startup overhead for the optional post-build registry feature
Why This Approach: Consistent with existing lazy-loading patterns in the codebase, minimal risk, clear performance benefit
Risk Assessment: Very low risk - functionality unchanged, proper dynamic import syntax

Critical Concerns

None identified.

Final Recommendation

• Rating: ⭐⭐⭐⭐☆ (4/5)
• Action: APPROVE
• Reasoning: Well-executed performance optimization with proper lazy-loading implementation. The change is focused, low-risk, and follows established patterns in the codebase. Documentation cleanup is appropriate. Only minor point: this is an incremental optimization rather than a significant feature, hence 4/5 rather than 5/5.

[greptile-apps]

Greptile Summary

This PR completes a cleanup milestone by lazy-loading node:os in builder.js and removing the dogfooding guide after all action items were resolved.

Key changes:

• Lazy-loaded node:os in builder.js — the sole os.tmpdir() call moved behind dynamic import in the post-build registry block (lines 832-833)
• Deleted docs/dogfooding-guide.md — all 7 documented action items have been resolved
• Added test coverage for existing readFileSafe retry logic and symlink loop detection in collectFiles
• Added STABILITY.md documenting anticipated stability policy (not yet active, pending architectural refactoring)
• Updated roadmap documentation: removed Phase 3 (Architectural Refactoring) from active roadmap and renumbered phases
• Added Greptile PR review documentation to CLAUDE.md

The lazy-loading change is sound: watcher.js correctly continues using eager imports since all its dependencies are essential for the hot path. The entire post-build registry block in builder.js now uses only lazy-loaded deps (node:os and registry.js).

Confidence Score: 5/5

• Safe to merge — housekeeping changes with solid test coverage
• All changes are low-risk: lazy-loading optimization is correctly scoped, documentation updates are consistent, deleted file's action items are resolved, and new test coverage validates existing functionality. Test plan confirms 463 tests pass.
• No files require special attention

Important Files Changed

Filename	Overview
src/builder.js	Lazy-loaded node:os behind dynamic import in post-build registry block
tests/unit/builder.test.js	Added test coverage for readFileSafe retry logic and symlink loop detection in collectFiles
docs/dogfooding-guide.md	Deleted — all 7 action items resolved according to PR description
CLAUDE.md	Added Greptile PR review section documenting re-review trigger via @greptileai comment
README.md	Updated roadmap reference to include STABILITY.md and renumbered phases (architectural refactoring removed from active roadmap)
ROADMAP.md	Removed Phase 3 (Architectural Refactoring) from active roadmap, renumbered remaining phases 3-8 to 3-7
STABILITY.md	New file documenting anticipated stability policy, semver guarantees, and deprecation process (not yet active)

_{Last reviewed commit: 603ee55}

[greptile-apps]

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