Stage 1: walk while healing legs, for SPT 4.0.13

Ground-up reimplementation of yox92/SmartAction targeting SPT 4.0.13 /
EFT 0.16.9.0.40087. Only the walk-while-healing feature is implemented;
see NOTES.md for status and the deferred sprint work.

Design departures from upstream:

- CanWalk is a guarded postfix, not a transpiler. Upstream rewrote the
  method body, which affects every MovementContext in the raid including
  bots, and is hard-incompatible with the three other mods already
  patching MovementContext in a typical load order (SAIN, ORBIT,
  maschine-DualSideDoorBreach). A postfix that only flips false -> true
  for IsYourPlayer is inert for other entities by construction.

- The postfix re-tests ObstacleCollisionFacade_1.CanMove() before
  lifting. Upstream's transpiler dropped that check along with the
  HealingLegs check, silently disabling obstacle blocking.

- Targets resolve by name via AccessTools.PropertyGetter + nameof rather
  than by GClass number, so they survive EFT version bumps.

Verified in-game against 78 loaded plugins: both patches attach, the
guard rejected 985 non-local MovementContext calls with zero leaks, and
_player was never null across ~4000 guard calls.

CanSprintPatch is parked in deferred/ rather than deleted:
MovementContext.CanSprint does not gate sprinting (EnableSprint calls
Physical.Sprint unconditionally), and forcing it true makes EnableSprint
run ForceStopInteractions()/RemoveLeftHandItem() mid-heal. Details and
the 3.11 -> 4.0.13 rename table are in NOTES.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

SmartAction.csproj

@@ -0,0 +1,41 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>disable</Nullable>
+    <AssemblyName>SmartAction</AssemblyName>
+    <RootNamespace>SmartAction</RootNamespace>
+    <Version>2.0.0</Version>
+    <RestoreSources>https://api.nuget.org/v3/index.json</RestoreSources>
+    <!-- BSG/Unity assemblies are resolved straight out of the game install.
+         Override on the command line for a different install:
+           dotnet build -p:SptDir=/path/to/SPT -->
+    <SptDir Condition="'$(SptDir)' == ''">/mnt/games/SPT</SptDir>
+    <ManagedDir>$(SptDir)/EscapeFromTarkov_Data/Managed</ManagedDir>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- Game -->
+    <Reference Include="Assembly-CSharp"          HintPath="$(ManagedDir)/Assembly-CSharp.dll"          Private="false" />
+    <Reference Include="Comfort"                  HintPath="$(ManagedDir)/Comfort.dll"                  Private="false" />
+    <Reference Include="UnityEngine"              HintPath="$(ManagedDir)/UnityEngine.dll"              Private="false" />
+    <Reference Include="UnityEngine.CoreModule"   HintPath="$(ManagedDir)/UnityEngine.CoreModule.dll"   Private="false" />
+    <!-- BepInEx + Harmony -->
+    <Reference Include="BepInEx"                  HintPath="$(SptDir)/BepInEx/core/BepInEx.dll"         Private="false" />
+    <Reference Include="0Harmony"                 HintPath="$(SptDir)/BepInEx/core/0Harmony.dll"        Private="false" />
+    <!-- SPT -->
+    <Reference Include="spt-reflection"           HintPath="$(SptDir)/BepInEx/plugins/spt/spt-reflection.dll" Private="false" />
+  </ItemGroup>
+
+  <!-- Opt-in deploy:  dotnet build -p:DeployToGame=true -->
+  <Target Name="DeployToGame" AfterTargets="Build" Condition="'$(DeployToGame)' == 'true'">
+    <PropertyGroup>
+      <PluginDir>$(SptDir)/BepInEx/plugins/SmartAction</PluginDir>
+    </PropertyGroup>
+    <MakeDir Directories="$(PluginDir)" />
+    <Copy SourceFiles="$(TargetPath)" DestinationFolder="$(PluginDir)" />
+    <Message Importance="high" Text="Deployed $(TargetFileName) -> $(PluginDir)" />
+  </Target>
+
+</Project>