bugfix/meijer-g-indexing

[RotemKalisch]

Fix m and n index bug in Meijer G, and add a regression test for the bug.
Autoformatter changed some pickle code around, but it's the same code.

[Copilot]

Pull request overview

Fixes an off-by-one indexing bug in the Meijer G CMF matrix construction so that the sign changes at the correct boundary indices n (for a_i) and m (for b_j), and adds a regression test to prevent reintroducing the issue.

Changes:

• Corrected Meijer G sign logic from index > n/m to index >= n/m in construct_matrix.
• Added a regression test (test_m_n_sign) covering the boundary case where index == n / index == m.
• Applied formatting-only updates to MeijerG pickling state handling and related test assertions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ramanujantools/cmf/meijer_g.py	Fixes boundary indexing for m/n when determining the sign in construct_matrix.
ramanujantools/cmf/meijer_g_test.py	Adds a regression test for the m/n boundary sign bug; formatting-only adjustments in serialization assertions.

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