CLI Diff Command - Changes

REMOVED Requirements

Requirement: Display Format

Reason for removal: The standard unified diff format is replaced by requirement-level side-by-side comparison that better shows semantic changes rather than line-by-line text differences.

MODIFIED Requirements

Requirement: Diff Output

The command SHALL show a requirement-level comparison displaying only changed requirements.

Scenario: Side-by-side comparison of changes

WHEN running openspec diff <change>
THEN display only requirements that have changed
AND show them in a side-by-side format that:
- Clearly shows the current version on the left
- Shows the future version on the right
- Indicates new requirements (not in current)
- Indicates removed requirements (not in future)
- Aligns modified requirements for easy comparison

Requirement: Validation

The command SHALL validate that changes can be applied successfully.

Scenario: Invalid delta references

WHEN delta references non-existent requirement
THEN show error message with specific requirement
AND continue showing other valid changes
AND clearly mark failed changes in the output

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