docs(repository-review): add comprehensive repository review artifacts and improvement roadmap

[cto-new]

Summary

• Introduces a complete repository review package that documents strengths, gaps, and a phased improvement roadmap for packaging, testing, and documentation.
• Adds a cohesive hub of review materials (REVIEW_INDEX.md, REVIEW_QUICK_START.md, REVIEW_SUMMARY.txt, GAPS_AND_ISSUES.md, IMPROVEMENTS_ROADMAP.md) to guide planning and execution.
• Establishes a Phase 1 focus on critical infrastructure, including Python packaging scaffolding and release readiness.

Details

• Created REVIEW_INDEX.md as the navigational hub for the review package.
• Documented gaps and issues with severity levels and remediation strategies in GAPS_AND_ISSUES.md.
• Outlined phased improvements: Phase 1 (critical infrastructure), Phase 2 (maintainability), Phase 3 (enhancements).
• Added Phase 1 packaging and documentation scaffolding: pyproject.toml, setup.py, VERSION, CHANGELOG.md, MANIFEST.in, .coveragerc, mypy.ini, py.typed, and ancillary docs.
• Introduced installation and distribution guidance through INSTALLATION_GUIDE.md and DISTRIBUTION_GUIDE.md.
• Added new deliverable and completion summaries (PHASE_1_COMPLETION.md, IMPLEMENTATION_SUMMARY.md, START_HERE.md, DELIVERABLES.md) that capture scope, status, and next steps.

Impact

• Enables packaging, versioning, and release pipelines to be established and maintained.
• Improves maintainability with structured docs, a clear roadmap, and a formal review package.
• Provides a PyPI-distributable packaging baseline and a concrete path to Phase 2 improvements.

Next steps

• Proceed with Phase 2 planning (code quality, test organization, type enforcement).
• Align CI/CD to run packaging validation, tests, and type checks.
• Use IMPROVEMENTS_ROADMAP.md to drive future milestones.

Notes

• This PR focuses on documentation and packaging scaffolding to set a solid foundation for future feature work.

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