Migrate CI and install docs to uv

[gomezzz]

Summary

Switches CI and install docs to uv (Python 3.8 — the only Python with pip wheels for pykep 2.6, the 2.x API PASEOS depends on). conda/environment.yml is kept as the cross-platform + newer-Python path.

• CI + docs → uv: rewrite run_tests.yml to astral-sh/setup-uv on Python 3.8, replacing the deprecated provision-with-micromamba@main that had CI failing; README build instructions lead with uv. A [tool.uv] override drops pykep's broken sklearn shim dependency; MPLBACKEND=Agg keeps the headless visualization test from blocking; pytest-timeout added as a safety net.
• Thermal test robustness: test_thermal runs in real-time mode; a 200x multiplier made slow/loaded runners spiral into unbounded catch-up. Lowered to 20x with a generous heated-up assertion window.

Result: 36/36 tests pass on the uv/Python 3.8 runner (~4 min), lint + format green.

Test plan

• CI Running tests green — 36 passed
• CI Ruff Lint and Format Check green

⚠️ Top of the stack. Merge order: #217 (pyproject) → #218 (ruff) → #220 (advance_time fix) → #219 (this).

Note: the required advance_time engine fix now lives in its own PR (#220), on which this is based.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	33	1	97%	48
paseos.py	144	12	92%	67–68, 145–146, 203, 218, 236, 245, 263, 294, 302, 305
activities
activity_manager.py	43	3	93%	46, 74, 156
activity_processor.py	57	0	100%
activity_runner.py	62	10	84%	80–81, 84, 104, 108–109, 112–113, 122, 125
actors
actor_builder.py	185	32	83%	24–25, 27, 30, 33, 223–225, 256–258, 312, 316–317, 320–321, 342, 344–345, 348–349, 488, 545, 573, 585–586, 588–589, 596–597, 604–605
base_actor.py	128	18	86%	82, 104, 120, 167, 207–209, 230, 239, 256, 277, 283–286, 292, 307, 362
ground_station_actor.py	15	3	80%	47, 51, 53
spacecraft_actor.py	60	1	98%	122
central_body
central_body.py	65	5	92%	68, 177–178, 186–187
is_in_line_of_sight.py	58	12	79%	107–108, 110, 112–117, 124, 168, 188
mesh_between_points.py	35	2	94%	64, 72
sphere_between_points.py	26	8	69%	35, 37–38, 48, 50–51, 63–64
communication
find_next_window.py	20	0	100%
get_communication_window.py	23	2	91%	38, 64
geometric_model
geometric_model.py	28	16	43%	32, 34–38, 47, 49, 61, 76, 78–79, 92–93, 101–102
power
charge_model.py	16	1	94%	50
discharge_model.py	7	1	86%	34
power_device_type.py	4	0	100%
radiation
radiation_model.py	32	0	100%
tests
activity_test.py	56	3	95%	92, 95–96
actor_builder_test.py	63	0	100%
communication_window_test.py	48	1	98%	177
custom_propagator_test.py	25	0	100%
custom_property_test.py	23	0	100%
default_cfg_test.py	9	0	100%
eclipse_test.py	10	1	90%	20
event_based_test.py	23	0	100%
import_test.py	6	1	83%	13
init_test.py	8	1	88%	16
line_of_sight_test.py	62	4	94%	143–146
mesh_test.py	119	3	97%	119, 137, 145
multiple_instance_test.py	12	0	100%
operations_monitor_test.py	31	0	100%
power_test.py	29	0	100%
radiation_test.py	59	0	100%
test_utils.py	17	0	100%
thermal_model_test.py	30	1	97%	70
time_multiplier_test.py	26	0	100%
visualization_test.py	18	1	94%	30
thermal
thermal_model.py	75	0	100%
utils
check_cfg.py	61	18	70%	31, 40, 46, 60–62, 67, 70–72, 75–77, 80–82, 98, 103
load_default_cfg.py	9	0	100%
operations_monitor.py	71	3	96%	127–128, 130
reference_frame.py	4	0	100%
set_log_level.py	6	0	100%
visualization
animation.py	18	6	67%	28–31, 36, 45
plot.py	9	3	67%	29–30, 32
space_animation.py	215	23	89%	109–110, 125, 148–149, 183, 207, 214, 220, 330, 353–355, 360, 369–370, 374, 410, 416–417, 448, 462, 473
TOTAL	2183	196	91%

Tests	Skipped	Failures	Errors	Time
36	0 💤	0 ❌	0 🔥	3m 59s ⏱️