Add session summary for exact position burn execution

docs/session_summaries/2026-02-21-exact-position-burn-execution.md

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+# Session Summary: Exact Position Burn Execution
+
+**Date:** 2026-02-21
+
+## Changes Made
+
+Implemented Option B from previous session's planning: exact position burn execution for true anomaly triggers.
+
+### Core Implementation
+- Added `scheduled_dt` field to `Maneuver` struct
+- Modified trigger logic to set `scheduled_dt` when crossing detected
+- Modified execution to propagate spacecraft to exact position before burn
+- Added wraparound handling for 2π→0 periapsis crossing
+- Added tracking array to prevent double-propagation in same frame
+
+### Files Modified
+- `src/maneuver.h` - Added scheduled_dt field
+- `src/maneuver.cpp` - Trigger logic, cleanup
+- `src/simulation.cpp` - Execution logic, tracking
+- `src/config_loader.cpp` - Initialize scheduled_dt
+- `tests/test_periapsis_burn.cpp` - Fixed tests
+- `tests/test_periapsis_burn.toml` - Fixed config
+- `tests/test_maneuver_planning.cpp` - Increased timeout
+- `docs/planning/exact_position_burn_execution.md` - Planning doc
+
+## Commits
+
+```
+680a8f4 Implement exact position burn execution for true anomaly triggers
+```
+
+## Results
+
+- Net line count: +146 lines (207 additions, 61 deletions)
+- All 143 tests passing
+- Burns now execute at exact orbital position (within floating-point precision)
+
+## Remaining Issues
+
+None - all tests passing, implementation complete.
+
+## Next Steps
+
+Consider updating technical_reference.md to document the new `scheduled_dt` field in the Maneuver struct.