Fix varlist index range for manifold dimension

[lwJi]

Motivation

• ParseVarlist previously assumed a 4D coordinate range (hard-coded 0..3) which is incorrect for other manifold dimensions.
• This could produce incorrect index loops for non-4D manifolds and repeated calls to GetDim[].

Description

• Compute the manifold dimension once with dim = GetDim[] and use it for logging.
• Derive iMin and iMax from dim instead of hard-coding iMax = 3 so index ranges match the manifold dimension.
• Introduced local dim variable and adjusted the Module locals in ParseVarlist accordingly (in src/Varlist.wl).

Testing

• No automated tests were run as part of this change.

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Codex Task