docs: add TypeScript migration phase to roadmap

[carlos-alm]

Summary

• Inserts Phase 4 — TypeScript Migration between the architectural refactoring phase (3) and intelligent embeddings phase (now 5)
• Renumbers all subsequent phases (old 4-8 → new 5-9) including sub-section headings, cross-references, dependency graph, and verification table
• Phase 4 covers: project setup, core type definitions, leaf → core → orchestration module migration, and test migration

Rationale

The TS migration is sequenced after Phase 3 because the architectural refactoring establishes clean module boundaries (Repository, Engine, BaseExtractor, Pipeline, Command) that serve as natural type boundaries. Migrating monolithic files before splitting them would be double work.

Test plan

• Verify all markdown anchor links resolve correctly
• Verify phase numbering is sequential 1-9 with no gaps
• Verify all "Depends on" cross-references point to correct renumbered phases

[claude]

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

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PR Review: TypeScript Migration Phase Addition

Todo List:

• Read the modified ROADMAP.md file to understand changes
• Phase 1: Root cause analysis - determine what problem this solves
• Phase 2: Configuration change detection
• Phase 3: Test integrity - verify markdown structure
• Phase 4: Code quality - documentation quality assessment
• Provide final assessment with rating and recommendation

Root Cause Analysis

Problem Being Solved: This PR addresses a logical gap in the roadmap sequencing. TypeScript migration was planned but not explicitly positioned relative to the architectural refactoring. The author correctly identified that migrating monolithic files to TypeScript before splitting them (Phase 3) would result in double work.

Why This Approach: The sequencing makes technical sense. Phase 3 creates clean module boundaries (Repository, Engine, BaseExtractor, Pipeline, Command objects) that serve as natural type boundaries. Migrating after these abstractions exist means typing well-bounded modules rather than massive 2,000+ line files.

Risk Assessment: Very low risk - this is purely documentation restructuring with no code changes.

Critical Concerns

None. This is documentation-only with logical improvements to sequencing.

Technical Review

✅ Documentation Quality

• Comprehensive planning: Phase 4 includes proper breakdown (4.1-4.6) covering project setup, type definitions, incremental migration strategy, and test migration
• Clear migration strategy: Leaf → core → orchestration approach is sound and well-explained
• Integration with existing phases: Properly references Phase 3 abstractions and serves as foundation for later phases

✅ Structural Integrity

• Phase numbering: Correctly renumbered all subsequent phases (4→5, 5→6, etc.) throughout the document
• Cross-references: All internal links and "Depends on" references properly updated
• Dependency graph: ASCII diagram correctly shows Phase 4 positioned after Phase 3 and before branches to Phases 5, 7, 8
• Table of contents: Overview table properly reflects new numbering

✅ Technical Accuracy

• Realistic scope: TypeScript migration includes proper project setup, strict mode configuration, incremental compilation
• Sound approach: Leverages Phase 3's modular structure, uses allowJs: true for gradual migration
• Appropriate verification criteria: tsc --noEmit passes, no runtime behavior changes, all tests pass

✅ No Configuration Changes

This is pure documentation with no linting rules, build configuration, or test modifications.

Minor Observations

• The test plan in the PR description mentions verifying markdown links - while I didn't run automated link checking, manual inspection shows all internal anchors are properly formatted
• The 150/50 line change ratio is appropriate for inserting a full new phase while renumbering others
• Phase dependencies remain logically consistent (no circular dependencies introduced)

Final Recommendation

• Rating: ⭐⭐⭐⭐☆ (4/5)
• Action: APPROVE
• Reasoning: Well-planned documentation improvement that fixes a logical sequencing gap. The TypeScript migration is properly positioned after architectural refactoring, includes comprehensive planning, and maintains structural integrity of the roadmap. No technical issues identified.

The only reason this isn't 5 stars is that it's documentation-only rather than providing new functionality, but for a documentation change, this is exemplary work.

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[greptile-apps]

Greptile Summary

Inserts Phase 4 (TypeScript Migration) between architectural refactoring and intelligent embeddings phases, renumbering all subsequent phases from 4-8 to 5-9.

• All phase numbers updated consistently across overview table, section headers, subsections, dependency graph, and verification table
• All cross-references (Depends on: lines) correctly updated to point to renumbered phases
• All markdown anchor links verified to resolve to correct section headers
• New Phase 4 content includes 6 subsections covering project setup, type definitions, and incremental migration strategy from leaf modules to core to orchestration
• Rationale correctly explains sequencing: Phase 3's architectural refactoring establishes clean module boundaries that serve as natural type boundaries

Confidence Score: 5/5

• This documentation PR is safe to merge with no risk
• Documentation-only change with comprehensive and correct updates across all references. Phase numbering is sequential with no gaps, all cross-references updated correctly, and the new content is well-structured and detailed. No code changes, no functional impact.
• No files require special attention

Important Files Changed

Filename	Overview
docs/roadmap/ROADMAP.md	Added Phase 4 (TypeScript Migration) and renumbered all subsequent phases 4-8 to 5-9. All cross-references, dependencies, and anchor links updated correctly.

_{Last reviewed commit: 29dafcb}

[greptile-apps]

_{1 file reviewed, no comments}

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[carlos-alm]

I have read the CLA Document and I hereby sign the CLA

[carlos-alm]

recheck