fix(grammar): suppress shrink warnings for consumers

[dowdiness]

Summary

Suppress the unused_value and unused variable warnings from the GrammarIr QuickCheck Shrink implementations.

Context

Canopy's vendored-check promotes non-vendored warnings to errors. After the GrammarIr shrinker landed, Canopy's Loom submodule job failed on the property-test package even though Loom's own CI passed.

The implementations are intentionally test-only; package-level suppression keeps the property tests available to downstream workspaces that enable warning-as-error checks.

Verification

• moon check
• moon test -p dowdiness/loom/grammar --target wasm-gc (53 passed)

Summary by CodeRabbit

• Chores
  • Updated warning handling in grammar property tests to suppress selected warnings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b9a74a6a-5479-4daa-9a4c-b0686ac012cf

📥 Commits

Reviewing files that changed from the base of the PR and between 6f40002 and d545e67.

📒 Files selected for processing (1)

• loom/grammar/grammar_ir_properties_wbtest.mbt

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📝 Walkthrough

Walkthrough

Added three #warnings("-1-2") directives before grammar expression and type shrinker definitions. No logic, tests, or public APIs were changed.

Changes

Grammar shrinker warnings

Layer / File(s)	Summary
Suppress shrinker warnings loom/grammar/grammar_ir_properties_wbtest.mbt	Warning suppression directives were added before shrink_expr and the GrammarIr and GrammarWithTokens shrink implementations.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately describes the warning-suppression change.
Description check	✅ Passed	The summary, context, and verification are provided, but the template's checklist section is missing.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/suppress-grammar-shrink-warnings

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