Move native level setups into level files

- Delete NativeLevelFixtures.kt and make native repository setup an optional property of each Level.
- Move every existing native setup into its corresponding level file so setup, validation, and tests stay together.
- Add the missing Blame native setup with config.rb history and a Spider Man password commit.
- Add a native runtime regression that verifies `git blame config.rb` identifies Spider Man on the password line.
- Verify the full JVM test suite using the compiled host Git runtime.

app/src/main/java/solutions/tretter/githugandroid/levels/RevertLevel.kt

@@ -14,6 +14,16 @@ internal fun revertLevel(): Level = level(
     hints = listOf("Try the revert command."),
     commandSuggestions = listOf("git revert HEAD~1"),
     setup = { RepoState(initialized = true, commits = listOf(CommitNode("1", "First commit"), CommitNode("2", "Bad commit"), CommitNode("3", "Second commit")), branches = mapOf("master" to 3), pushedBranches = setOf("origin/master")) },
+    nativeSetup = {
+        resetFiles()
+        write("file1")
+        addCommit("First commit", "file1")
+        write("file3")
+        addCommit("Bad commit", "file3")
+        write("file2")
+        addCommit("Second commit", "file2")
+        true
+    },
     validator = repoPredicate { repo -> repo.commits.any { it.message.startsWith("Revert") } },
     testCases = listOf(
         levelTestCase("revert middle commit", "git revert HEAD~1"),