Add performance test size specifications to all challenge specs

[Copilot]

Challenge specs were missing performance test size information, making it unclear what dimensions are used for benchmarking. Only challenge 2 (matrix multiplication) documented this.

Changes

• Added performance test size bullets to Constraints section in 65 challenge specs
• Automated extraction via AST parsing of generate_performance_test() methods
• Consistent formatting: <code> tags for parameters, comma separators for values ≥ 1,000
• Updated CLAUDE.md to document the new spec format requirement for future challenges

Examples

Single parameter:

<li>Performance is measured with <code>N</code> = 25,000,000</li>

Multiple parameters:

<li>Performance is measured with <code>M</code> = 8,192, <code>N</code> = 6,144, <code>K</code> = 4,096</li>

All 66 challenges now explicitly document their performance test dimensions, and the challenge creation guide has been updated to require this for all new challenges.

Original prompt

To the spec add a bullet that says the test case size for the performanc test just like we do for challenge 2 matrix multiplication. Add this for all challenges

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[kunal-mansukhani]

@copilot Update CLAUDE.md to make note of this new change in spec format

[Copilot]

@copilot Update CLAUDE.md to make note of this new change in spec format

Updated CLAUDE.md to document the performance test size requirement in the challenge.html section and checklist (commit 24bd90b).