Dev

[panayang]

No description provided.

[panayang]

I am pretty unsure about the code quality issue as this is acturally done by owen.
Waiting for review.

[gemini-code-assist]

Code Review

This pull request introduces a new module for indefinite summation (anti-difference) and indefinite products, implementing symbolic closed-form rules, numerical evaluation helpers (including an Abel-Plana engine and a series expansion fallback), and AST/DAG integration. The review feedback highlights critical edge cases that need to be addressed: ensuring that closed-form rules for $a^x$ and $x^a$ do not incorrectly simplify expressions like $x^x$ by verifying that the base or exponent is constant with respect to the summation variable, and adding defensive checks to prevent division-by-zero or NaN errors in both symbolic simplification and numerical evaluation when the step size is zero.

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