fix: normalize PersistenceLength by n_frames instead of trajectory n_frames

[shubhrai23]

Resolves #5453

[Copilot]

Pull request overview

Fixes incorrect normalization in PersistenceLength when run(start=..., stop=...) processes only a subset of trajectory frames, ensuring results are normalized by the number of analyzed frames rather than the total trajectory length.

Changes:

• Normalize results.bond_autocorrelation using self.n_frames (frames actually processed by the analysis run) instead of self._trajectory.n_frames (total frames in the trajectory).

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Documentation build overview

📚 MDAnalysis | 🛠️ Build #34075537 | 📁 Comparing 720cf66 against latest (c882e5c)

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3 files changed

± index.html
± documentation_pages/analysis/wbridge_analysis.html
± _modules/MDAnalysis/analysis/polymer.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.87%. Comparing base (c882e5c) to head (720cf66).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5456   +/-   ##
========================================
  Coverage    93.87%   93.87%           
========================================
  Files          182      182           
  Lines        22522    22522           
  Branches      3206     3206           
========================================
  Hits         21143    21143           
  Misses         917      917           
  Partials       462      462           

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