Fix #343: Test TrieStorePort as runtime contract

[flyingrobots]

What changed

Removed the TrieStorePort source-regex assertion and replaced it with runtime module erasure coverage alongside the existing concrete implementor contract tests.

Why

The old check matched declaration text. The updated suite proves the port remains type-only at runtime and still compiles against a real implementation.

Closes #343

Validation

• npx vitest run test/unit/domain/orset/trie/TrieStorePort.test.ts
• 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: 086b8cbc-bb3f-4615-996e-08b35c099aef

📥 Commits

Reviewing files that changed from the base of the PR and between a21fb8b and 86c950d.

📒 Files selected for processing (1)

• test/unit/domain/orset/trie/TrieStorePort.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-343-trie-store-port-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GraphQL review-thread audit	0 unresolved, non-outdated review threads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-343-trie-store-port-contract	Pass
Added hard-ban token scan	Hard-ban diff scan found no actionable additions.