SW-108 — Add Changeset-required contributor examples

[dDevAhmed]

Summary

Improve contributor examples for when/how to add Changesets without changing release architecture.

Acceptance Criteria

• feature/fix/docs examples explain expected release impact;
• private/public package state is current;
• no automated publication is triggered;
• repository checks pass.

Dependencies

None.

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🏷 Labels

• Stellar Wave
• type: docs
• area: release
• priority: P2
• difficulty: low
• points: 100
• workstream: release