fix(language): forbid duplicate @default applications

[sanny-io]

Summary by CodeRabbit

• Attributes
  • The @default attribute is now restricted to single application per declaration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 70bdb004-71cd-478c-b91d-f181524882c9

📥 Commits

Reviewing files that changed from the base of the PR and between f41a1f6 and c696481.

📒 Files selected for processing (1)

• packages/language/res/stdlib.zmodel

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📝 Walkthrough

Walkthrough

A single-line change to stdlib.zmodel adds the @@@once marker to the @default attribute declaration, restricting it to be applied at most once per declaration rather than potentially multiple times.

Changes

Default Attribute Once Constraint

Layer / File(s)	Summary
@default attribute once constraint packages/language/res/stdlib.zmodel	The @default attribute declaration adds @@@once marker to restrict usage to a single application per target declaration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A single line makes the change so clean,
One @@@once marks where default's been seen,
No more duplicates in declarations day,
Constraints now tighter—hop hip hooray! 🐰✨

🚥 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 accurately describes the main change: adding @@@once to @default attribute to prevent duplicate applications.
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

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