docs: align README and roadmap with shipped functionality

[HecFranco]

Summary

Stop recommending abandoned CodeReviewGuardian; mark implementation phases that already shipped.

Test plan

• README / roadmap match the current tag and CLI surface
• No unrelated test or source changes in this PR

Summary by CodeRabbit

• Documentation
  • Updated installation guidance to recommend PHP Quality Tools.
  • Added a notice that Code Review Guardian is abandoned and should not be used for new projects.
  • Updated the implementation roadmap to reflect shipped Phase 1 and most of Phase 2 features in version 2.0.34.
  • Clarified that batch optimization and future conflict-analysis work remain open, and that the historical timeline is not scheduled.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1df05b1 and ed602b1.

📒 Files selected for processing (2)

• README.md
• docs/IMPLEMENTATION_ROADMAP.md

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📝 Walkthrough

Walkthrough

The README now documents PHP Quality Tools and identifies Code Review Guardian as abandoned. The implementation roadmap records the v2.0.34 status and clarifies that its timeline is historical.

Changes

Documentation updates

Layer / File(s)	Summary
Align project documentation README.md, docs/IMPLEMENTATION_ROADMAP.md	The README replaces the Code Review Guardian recommendation with PHP Quality Tools guidance. The roadmap records shipped and remaining implementation work and marks the historical timeline as non-scheduled.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to ed602

This documentation-only change aligns the README and roadmap with shipped functionality; no actionable merge-blocking risk remains after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the README and roadmap updates to reflect shipped functionality.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-roadmap-sync

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