Write OpenSpec Delta

Generate OpenSpec-compatible delta specs under openspec/changes/<change-id>/. This is a plumbing skill: day-to-day development normally goes through the ss-plan skill, whose Phase 0 runs this same logic automatically.

When To Use

• You need to align capability specs with reviewers before writing a full execution plan.
• You need to adjust delta specs without regenerating the plan.
• The ss-coding or ss-create-pr skill reported missing or invalid delta specs.

Inputs