Fix #600: test incremental index through public contract

[flyingrobots]

Closes #600.

Summary

• removes private IncrementalIndexUpdater helper calls from the test suite
• replaces them with public computeDirtyShards() contract checks
• keeps edge-metadata and adjacency behavior covered without as any

Validation

• npm exec vitest run test/unit/domain/services/IncrementalIndexUpdater.test.ts
• npm run typecheck:test
• npm run lint -- test/unit/domain/services/IncrementalIndexUpdater.test.ts
• git diff --check
• static scan: no new IncrementalIndexUpdater() as, as any, or private helper calls remain in the test
• WARP_QUICK_PUSH=1 git push -u origin fix-600-incremental-public-contract

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dd8cd209-9b77-495e-84a8-1b5bc65f92b5

📥 Commits

Reviewing files that changed from the base of the PR and between ab2e006 and fd4204c.

📒 Files selected for processing (1)

• test/unit/domain/services/IncrementalIndexUpdater.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-600-incremental-public-contract

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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GraphQL review-thread audit	0 unresolved, non-outdated review threads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-600-incremental-public-contract	Pass
Added hard-ban token scan	Hard-ban diff scan found no actionable additions.