Fix #381: Invalidate GC-derived caches

[flyingrobots]

What changed

Routed manual and auto GC through a shared compacted-state install path that clears derived materialized graph, logical index, property reader, index tree, and view-hash caches.

Why

GC previously swapped _cachedState directly, leaving derived read/index caches pointing at pre-compaction objects. The cache state is now invalidated consistently after compaction.

Closes #381

Validation

• npx vitest run test/unit/domain/services/controllers/CheckpointController.test.ts
• npm run typecheck:src -- --pretty false
• npm run typecheck:test -- --pretty false

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 99e87b1d-7bce-4207-9471-0fd935dd393a

📥 Commits

Reviewing files that changed from the base of the PR and between a21fb8b and 31bcbaa.

📒 Files selected for processing (2)

• src/domain/services/controllers/CheckpointController.ts
• test/unit/domain/services/controllers/CheckpointController.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-381-gc-cache-invalidation

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[github-actions]

Release Preflight

• package version: 18.0.0
• prerelease: false
• npm dist-tag on release: latest
• npm pack dry-run: passed
• jsr publish dry-run: passed

If you tag this commit as v18.0.0, release workflow will publish.

[flyingrobots]

@codex Code Lawyer Activity Summary

Issue	Severity	Source	File	Outcome
No actionable self-discovered issue found in this PR diff.	None	Self	PR diff against origin/main	No code changes made.

Validation:

Check	Result
GraphQL review-thread audit	0 unresolved, non-outdated review threads
GraphQL review audit	0 Changes Requested reviews
git diff --check origin/main...origin/fix-381-gc-cache-invalidation	Pass
Added hard-ban token scan	Hard-ban diff scan found no actionable additions.