Move Python launcher files from src/dd4pod/python to src/python

[Copilot]

Summary

• move the Python launcher files to src/python for clearer ownership
• update top-level CMake to include src/python instead of src/dd4pod
• keep install behavior unchanged for npsim and npsim.py

Validation

• cmake -S . -B build && cmake --build build && ctest --test-dir build --output-on-failure (fails in this environment due to missing DD4hepConfig.cmake/DD4hep 1.18)
• CodeQL checker: 0 alerts

[Copilot]

Pull request overview

This PR relocates the npsim Python launcher files into src/python and updates CMake to install them from the new location.

Changes:

• Adds src/python/npsim.py and src/python/npsim.in.
• Updates src/python/CMakeLists.txt to reference files in its own directory.
• Updates the top-level build to add src/python instead of src/dd4pod.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
CMakeLists.txt	Switches the launcher subdirectory included by the top-level build.
src/python/CMakeLists.txt	Installs the wrapper and Python launcher from the relocated directory.
src/python/npsim.in	Defines the installed shell wrapper for npsim.
src/python/npsim.py	Provides the DD4hep simulation launcher logic.

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[github-actions]

Capybara summary for PR 56

• sim_dis_10x100_minQ2=1000_epic_craterlake
• sim_dis_10x100_minQ2=1_epic_craterlake
• sim_dis_18x275_minQ2=1000_epic_craterlake
• sim_dis_18x275_minQ2=1_epic_craterlake
• sim_dis_5x41_minQ2=1_epic_craterlake
• sim_e_1GeV_20GeV_epic_craterlake
• sim_pi_1GeV_20GeV_epic_craterlake
  ^{_{Last updated 2026-05-17T20:48-04:00 93cafe6}}