SW-116 — Add local generator performance benchmark harness

[dDevAhmed]

Summary

Add a bounded local benchmark harness for all four generated templates without network/install time.

Acceptance Criteria

• all four generation paths are measured;
• benchmark excludes dependency/network delays;
• results are reproducible enough for regression comparison;
• repository checks pass.

Dependencies

• SW-042
• SW-043
• SW-046
• SW-049

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🏷 Labels

• Stellar Wave
• type: performance
• area: generator
• priority: P2
• difficulty: medium
• points: 150
• workstream: performance