menu interactive, refactor, perf tests, charge bar, debug menu stuff

CLAUDE.md

@@ -90,6 +90,7 @@ bash run_tests.sh
 # Individual tests:
 gdlint *.gd tests/*.gd                                # GDScript lint (gdtoolkit, installed via uv)
 godot --headless --script tests/logic_test.gd         # pure logic, ~2 s
+godot --headless --script tests/performance_test.gd   # frame-budget regression guard, ~4 s
 godot --headless --script tests/gameplay_test.gd      # full scene, bone sanity, ~4 s
 
 # Gameplay test with real rendering (inspect frame strip visually):
@@ -107,6 +108,13 @@ godot --script tests/gameplay_test.gd                 # opens a window, saves re
 
 Headless screenshots will be blank (Forward Plus has no display). Run without `--headless` to get real frame strips.
 
+### What the performance test catches
+Loads the full scene with `STRESS_MATADORS` (20) matadors, samples per-frame time
+during normal play and during a mass-ragdoll spike, and fails if the average
+exceeds 16 ms or any single frame exceeds 100 ms. Budgets are generous regression
+guards (not a target frame rate); the measured avg/peak/fps print every run so a
+gradual creep shows up before it trips the ceiling.
+
 ## Godot 4.x specifics
 
 - `wrapf` / `wrap` instead of manual modulo for angles