Make participant argument optional, analyze all if omitted

[AdityaGupta716]

Fixes #7

Problem

Running precice-cli profiling analyze with no participant argument led to an
error instead of showing stats for all participants.

Fix

• Made participant an optional positional argument (nargs="?", default=None)
• If no participant is provided, analyzeCommand now loops over all participants
  and displays analysis for each one

Now both of these work correctly:

• precice-cli profiling analyze <participant> — analyze a single participant
• precice-cli profiling analyze — analyze all participants

[precice-bot]

This pull request has been mentioned on preCICE Forum on Discourse. There might be relevant details there:

https://precice.discourse.group/t/gsoc-2026-aditya-gupta/2773/1

[AdityaGupta716]

hi @fsimonis, addressed both of your points Extracted the DataFrame computation into a separate computeAnalysis() function so analyzeCommand is purely control flow with no recursion. Also added an early error with a clear message to stderr when --output is provided without a participant. Added two tests covering both behaviors all 26 tests pass.

[AdityaGupta716]

Hi @fsimonis , addressed all three points:Moved print(f"Output timings are in {unit}.") to analyzeCommand so it prints once per invocation,computeAnalysis now purely computes and returns the DataFrame all printing is handled by the caller ,Moved the assertion directly below all_participants
All 26 tests still pass.

[fsimonis]

Tested locally and looks good.
Thanks for the contribution!