docs: track deferred review decisions

[gaelic-ghost]

Summary

• track deferred review decisions in the roadmap after the v0.2.0 persistence and facade work

Verification

• swift test
• scripts/repo-maintenance/validate-all.sh

Summary by CodeRabbit

• Documentation
  • Updated project roadmap with planning notes for future development phases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: dceb31d7-3c57-4dcb-ab61-e1d6f5f18827

📥 Commits

Reviewing files that changed from the base of the PR and between 0048e8e and 6aba266.

📒 Files selected for processing (1)

• ROADMAP.md

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📝 Walkthrough

Walkthrough

ROADMAP.md adds four new unchecked planning items: one to Milestone 4 about whether Core Data test helpers should explicitly clean temporary directories, and three to Milestone 5 addressing XCTest-to-Swift Testing migration for vector-index tests, potential API shape refinement for KnowledgeBase.hashingDefault(dimension:), and optimization strategies for CoreDataVectorIndex.search.

Changes

Roadmap Planning Items

Layer / File(s)	Summary
Milestone planning items ROADMAP.md	Milestone 4 gains a test-infrastructure planning item on temporary-directory cleanup strategy. Milestone 5 gains three items: vector-index test framework migration, KnowledgeBase.hashingDefault(dimension:) API shape refinement, and CoreDataVectorIndex.search performance optimization candidates.

🎯 1 (Trivial) | ⏱️ ~2 minutes

🐰 A roadmap's grown so bright and clear,
With futures planned for what's next year,
From temp dirs cleaned to searches fast,
Each milestone marks a thoughtful cast,
The path ahead, now written well!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: track deferred review decisions' accurately describes the main change—adding deferred review decisions to ROADMAP.md after v0.2.0 work.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/deferred-review-roadmap

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