change repair_tool application and add beams for salvager and repair_tool

src/lib/core/Tick.h

@@ -8,6 +8,12 @@ constexpr int kTickRateHz = 30;
 constexpr double kTickDurationMs = 1000.0 / kTickRateHz;
 constexpr double kTickDurationSeconds = 1.0 / kTickRateHz;
 
+// Delay between a tool activating (emitting its beam) and its effect being
+// applied — half the 0.3 s beam duration. Shared by weapons, repair tools, and
+// salvage modules so all three apply their effect mid-beam (REQ-SHP-FIRING,
+// REQ-SHP-FIRING-BEAM).
+constexpr Tick kBeamImpactDelayTicks = 5;
+
 // Converts a wall-clock duration (in seconds, as it appears in config TOML) to
 // an integer tick count. Rounds to nearest to avoid systematic drift from
 // repeated conversions.