[DSL] 7.5 Optimization + Final Official Release Cleanup

[margaretjgu]

Size: M

Description:
Performance optimization and bundle size reduction.

Implementation:

• Profile render performance
• Optimize string concatenation
• Verify tree-shaking works
• Measure bundle sizes

Acceptance:

• Benchmark suite created
• No performance regressions
• Tree-shaking verified (unused code eliminated)
• Bundle size documented
• ESM and CJS both optimized