Fix level setup, reword flow, and catalog scope

- create and enter the level's declared starting directory
- inspect Git state from the repository containing the active directory
- start the init level in /sandbox/git_hug and cover it with a runtime test
- apply edited reword subjects as commit messages in the in-app rebase editor
- cover rename_commit with a native interactive rebase regression test
- remove the upstream contribute call to action from the playable level catalog
- update level parity documentation

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

@@ -26,6 +26,14 @@ class GitHelpCommandsTest {
         assertEquals("git --help tag", invocation?.command)
     }
 
+    @Test
+    fun leavesGitHelpListingOptionsForNativeGit() {
+        assertNull(parseGitHelpInvocation("git help -a"))
+        assertNull(parseGitHelpInvocation("git help --all"))
+        assertNull(parseGitHelpInvocation("git help -g"))
+        assertNull(parseGitHelpInvocation("git help --guides"))
+    }
+
     @Test
     fun parsesManGitCommand() {
         val invocation = parseGitHelpInvocation("man git-cherry-pick")