Update build/test docs: remove make run, add Catch2 filtering patterns

- Remove make run target from Makefile (agents should not run graphical sim)
- Update AGENTS.md: clarify make test vs make test-build, add Simulation section
- Update technical_reference.md Build System: add tag/name/section filtering
- Add SCENARIO section docs with --section flag and fixture behavior notes
- Use ./build/orbit_test path, rename config_name to tag_name throughout

AGENTS.md

@@ -43,10 +43,15 @@
 
 ## Common Commands
 - Build: make
-- Test: make test
-- Test (with extra debug info): ./orbit_test -s '[config_name]'
+- Test (build + run all): make test
+- Test (rebuild only): make test-build
+- Test (specific tag): ./build/orbit_test '[tag_name]'
+- Test (with debug output): ./build/orbit_test -s '[tag_name]'
     - needed to display 'INFO' statements for successful tests with Catch2 framework
-- See README.md for full build instructions
+- See docs/technical_reference.md for full build target reference
+
+## Simulation
+The simulation binary is built at `./build/orbit_sim`. Agents should NOT attempt to run the graphical simulation. Focus on testing and code changes only.
 
 ## Testing Guidelines
 - Always use `WithinAbs()` for floating-point comparisons

Makefile

@@ -64,10 +64,6 @@ clean-all: clean
 # Rebuild
 rebuild: clean all
 
-# Run the simulation
-run: $(TARGET)
-	./$(TARGET)
-
 $(TEST_OBJECTS): $(BUILD_DIR)/%.o : $(TEST_DIR)/%.cpp
 	$(CXX) $(CXXFLAGS) -c $< -o $@
 
@@ -88,4 +84,4 @@ test-build: $(BUILD_DIR) $(C_OBJECTS) $(CPP_OBJECTS) $(TEST_OBJECTS)
 test: test-build
 	./$(TEST_TARGET)
 
-.PHONY: all clean clean-all rebuild run test test-build raylib ctags
+.PHONY: all clean clean-all rebuild test test-build raylib ctags

docs/technical_reference.md

@@ -249,17 +249,40 @@ All satisfy vis-viva: v² = μ(2/r - 1/a).
 
 ## Build System
 
-**Targets**: make, make all, make raylib, make run, make test, make test-build, make clean, make rebuild.
+**Targets**: make / make all (build + ctags), make raylib, make test, make test-build, make clean, make clean-all, make rebuild.
 
 **Dependencies**: g++ (C++14), raylib (git submodule), raygui (header-only), tomlc17, Catch2 (tests only).
 
 **Testing**:
 ```bash
-make test                    # Run all tests
-./orbit_test '[config_name]' # Run specific config
-./orbit_test -s '[config]'   # With debug output
+make test                    # Build and run all tests
+make test-build              # Rebuild test executable only
 ```
 
+### Running Specific Tests
+
+The test binary is at `./build/orbit_test`. Catch2 v3.7.1 supports multiple filtering strategies:
+
+```bash
+./build/orbit_test '[analytical]'          # By tag
+./build/orbit_test "*barker*"              # By name (wildcard)
+./build/orbit_test '*burn*' [hybrid]       # Combined: name AND tag
+./build/orbit_test '[hohmann]~[energy]'    # Exclude tag (~)
+./build/orbit_test -s '[tag]'              # With debug/INFO output
+```
+
+Tags are the most common filter. Multiple tags on the command line use AND logic (test must have all tags). The `~` operator excludes a tag.
+
+### SCENARIO Sections
+
+SCENARIO tests group related assertions under SECTION sub-tests. Each SECTION is an independent test case — setup code before all SECTIONs runs once per SECTION, so fixtures are recreated. This allows drilling into specific parts:
+
+```bash
+./build/orbit_test '[hohmann]' --section "First burn at perigee raises apogee"
+```
+
+In `--list-tests` output, SCENARIO tests display with "Scenario: " prefix. When filtering by name, wildcards handle the prefix transparently.
+
 Use `WithinAbs(expected, tolerance)` for floating-point comparisons (NOT `Approx()`).
 
 ## Hybrid Documentation Strategy