docs: session summary for test_extreme_orientation_mixed refactor

docs/session_summaries/2026-04-30-test-extreme-orientation-mixed.md

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+# Session 2026-04-30: test_extreme_orientation_mixed
+
+## Changes Made
+- Refactored `test_extreme_orientation_mixed.cpp` from 7 TEST_CASEs to 1 SCENARIO with 8 SECTIONs
+- Created TOML 1.0 config (`tests/test_extreme_orientation_mixed.toml`)
+- Created precalc script (`scripts/precalc_extreme_orientation_mixed.py`) using sim_engine.Simulator
+- Consolidated loop variables using `std::array<Spacecraft*, 5>` instead of 25 individual vars + 5 arrays
+- Replaced trivial `REQUIRE(r > 0)` / `REQUIRE(v > 0)` with precalculated value assertions
+- Added named tolerance constants: `VDOT_TOL = 1e-3`, `MAT_TOL = 1e-10`
+- Added comments to reasonable safety checks (sqrt guard, angular momentum, rotation matrix behavior)
+
+## Commits
+1. `a7ecc46` — refactor: test_extreme_orientation_mixed
+2. `2e6b3d4` — cleanup: remove old test files
+3. `f8f7037` — docs: update continue.md
+
+## Results
+- 142 assertions, all passing
+- Full suite: 579 assertions in 15 test cases, all passing
+- Net line count: +423 (test), -480 (old test), +1 (continue.md)
+
+## Remaining Issues
+- None
+
+## Next Steps
+- Next test to refactor: `test_extreme_timescales`