Tighten Rm level validation

- Require the Rm level to stage or remove the tracked deleted file instead of treating the initial deleted worktree state as solved.
- Add a regression test proving read-only commands such as `ls` do not complete the Rm level.
- Verify the full JVM level solution suite with the compiled host Git runtime.

app/src/test/java/solutions/tretter/githugandroid/GitSandboxEngineTest.kt

@@ -37,6 +37,16 @@ class GitSandboxEngineTest {
         assertFalse(updatedRepo.files.any { it.name == "deleteme.rb" })
     }
 
+    @Test
+    fun rmLevelIsNotSolvedByReadOnlyCommands() {
+        val level = rmLevel()
+        val repo = level.setup()
+
+        val (updatedRepo, _) = GitSandboxEngine.execute(repo, "ls")
+
+        assertFalse(level.validator(updatedRepo, "ls"))
+    }
+
     @Test
     fun gitMvExpandsWildcardSourcesIntoDestinationDirectory() {
         val repo = RepoState(