Allow J_a_fluence on non-uniform time grids

[goerz]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.7%. Comparing base (5d4e99f) to head (894696b).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #108     +/-   ##
========================================
+ Coverage    87.7%   87.7%   +0.1%     
========================================
  Files          20      20             
  Lines        1124    1128      +4     
========================================
+ Hits          985     989      +4     
  Misses        139     139             

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull request overview

This PR updates the pulse-fluence running cost to handle non-uniform time grids, aligning J_a_fluence and its analytic gradient with interval-dependent dt_n weights rather than a single uniform timestep.

Changes:

• Reworked J_a_fluence and grad_J_a_fluence to weight each interval by diff(tlist).
• Expanded the J_a_fluence/make_grad_J_a docs to describe the pulse vectorization layout and non-uniform-grid behavior.
• Added a regression test covering a non-uniform tlist and validating the analytic and Zygote gradients.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/functionals.jl	Implements non-uniform timestep weighting in the fluence functional and updates related documentation.
test/test_functionals.jl	Adds regression coverage for non-uniform grids and checks the analytic/Zygote gradient results.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.