BUG: seed parachute pressure noise with per-instance RNG (#1091)

[thatrandomasiandev]

Summary

• Give Parachute an optional seed and a per-instance numpy.random.Generator so pressure noise no longer draws from the process-global RNG (Fixes #1091).
• Thread a derived noise seed from StochasticParachute into created parachutes when Monte Carlo seeds the model.
• Add unit tests for same-seed reproducibility, different-seed divergence, default unseeded behavior, and independence from the global NumPy RNG.

Test plan

• PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 PYTHONPATH=. pytest tests/unit/rocket/test_parachute_noise_seed.py tests/unit/rocket/test_parachute.py tests/unit/stochastic/test_stochastic_parachute.py
• Spot-check that two Monte Carlo runs with the same root seed produce identical parachute noise sequences when noise is non-zero

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.29%. Comparing base (e0ff281) to head (469b750).
⚠️ Report is 53 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1134      +/-   ##
===========================================
+ Coverage    82.18%   83.29%   +1.11%     
===========================================
  Files          122      130       +8     
  Lines        16355    17080     +725     
===========================================
+ Hits         13441    14227     +786     
+ Misses        2914     2853      -61     

☔ View full report in Codecov by Harness.
📢 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.