Support "Square Root" Tower Height Scaling (?scale=sqrt)

[nishtha-agarwal-211]

Feature Description

CommitPulse allows users to scale tower heights using either a linear scale or a logarithmic log scale (?scale=linear or ?scale=log).

• Linear scaling can cause high-volume days (e.g., 20+ commits) to completely tower over days with 1-2 commits.
• Logarithmic scaling compresses values so much that the visual difference between a 1-commit day and a 10-commit day is barely noticeable.
  A Square Root (sqrt) scaling model acts as the perfect middle ground. It visually highlights variances in low-to-medium commits while keeping high-volume commits from dominating the grid.

Proposed Solution

1. Update the scale option validation in lib/validations.ts (streakParamsSchema) to support sqrt as an allowed value.
2. Locate the tower height computation logic in the codebase (e.g., lib/svg/layout.ts or lib/svg/generator.ts).
3. Implement the square root scaling formula:
   $$h_{scaled} = h_{max} \times \sqrt{\frac{commits}{maxCommits}}$$
4. Update parameter lists and descriptions in docs/customization.md.

Definition of Done (DoD)

• The API accepts ?scale=sqrt without failing back to the default linear scale.
• Tower heights are calculated correctly according to the square root of the contribution counts.
• Visual alignment of the isometric towers remains precise and does not clip or overflow.
• Unit tests are implemented to verify the math is correct for scale=sqrt.

[nishtha-agarwal-211]

/claim

[github-actions]

🎉 Assigned! Welcome to the project, @nishtha-agarwal-211.

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