[Feature]: Add /speckit.verify Command for Implementation Validation

[mohseenjamall]

Problem Statement

After executing /speckit.implement in the Spec-Driven Development workflow,
there is no structured verification step to ensure:

• All tasks from tasks.md were completed successfully
• Implementation matches the specification and plan
• No requirements were missed or overlooked
• Code quality standards are maintained
• All acceptance criteria are satisfied

This creates a gap in the workflow where manual verification passes are needed.

Proposed Solution

Add a new optional /speckit.verify command that:

1. Cross-references all tasks from tasks.md against the actual implementation

2. Generates a comprehensive verification checklist:

   • ✅ Tasks completed status
   • ✅ Files created/modified list
   • ✅ Specification requirements met
   • ✅ Plan followed correctly
   • ✅ Constitution standards maintained
   • ✅ No regressions introduced

3. Identifies any gaps or incomplete tasks

4. Produces a final verification report for stakeholder review

This would complete the spec-driven workflow:
specify → clarify → plan → analyze → tasks → implement → verify

Alternatives Considered

No response

Component

Specify CLI (initialization, commands)

AI Agent (if applicable)

None

Use Cases

No response

Acceptance Criteria

No response

Additional Context

No response

[mnriem]

Does https://github.com/github/spec-kit/tree/main/extensions#available-community-extensions work for your scenario?