Improve upstream parity for level fixtures

- Add native per-level fixtures for complex histories, tags, branch graphs, rebases, resets, restores, stashes, and local remotes.
- Strengthen repository inspection so branch commit counts, remote-tracking branches, and detached tag checkouts reflect real Git state.
- Align Fetch, Pull, Push Branch, Branch At, and Rebase validators/tests with upstream-style repository state.
- Keep the prompt callout and native filesystem tab-completion fixes from the previous batch.

app/src/main/java/solutions/tretter/githugandroid/GitHugApp.kt

@@ -15,6 +15,7 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.rememberScrollState
@@ -39,15 +40,18 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.Alignment
+import androidx.compose.ui.geometry.Rect
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Path
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.sp
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -91,6 +95,7 @@ fun GitHugApp() {
         var showHelpOverlay by remember { mutableStateOf(false) }
         var showHelpOnStart by remember { mutableStateOf(true) }
         var helpPreferenceInitialized by remember { mutableStateOf(false) }
+        var promptBounds by remember { mutableStateOf<Rect?>(null) }
         val currentLevel = levels[currentLevelIndex]
 
         LaunchedEffect(solvedCelebrationTitle) {
@@ -293,7 +298,7 @@ fun GitHugApp() {
             val isCdCompletion = leadingCommand == "cd"
             if (token.isBlank() && !isCdCompletion) return
 
-            val candidates = if (isCdCompletion) directoryCompletionCandidates(repo) else fileCompletionCandidates(repo)
+            val candidates = runtime.completionCandidates(currentLevel, repo, directoriesOnly = isCdCompletion)
             val matches = candidates.sorted().filter { it.startsWith(token) }
             if (matches.isEmpty()) return
 
@@ -572,6 +577,7 @@ fun GitHugApp() {
                                     onCursorRight = { moveCursor(1) },
                                     onHistoryUp = { historyUp() },
                                     onHistoryDown = { historyDown() },
+                                    onPromptBoundsChanged = { promptBounds = it },
                                 )
                             },
                         )
@@ -585,6 +591,7 @@ fun GitHugApp() {
                                 scope.launch { gameProgressStore.saveShowHelpOnStart(showHelpOnStart) }
                             },
                             onClose = { showHelpOverlay = false },
+                            promptBounds = promptBounds,
                         )
                     }
                 }
@@ -663,7 +670,9 @@ private fun HelpCalloutOverlay(
     onShowHelpOnStartChange: (Boolean) -> Unit,
     onOk: () -> Unit,
     onClose: () -> Unit,
+    promptBounds: Rect?,
 ) {
+    val density = LocalDensity.current
     Box(
         modifier = Modifier
             .fillMaxSize()
@@ -674,9 +683,12 @@ private fun HelpCalloutOverlay(
             modifier = Modifier.align(Alignment.TopStart),
         )
         HelpBubbleWithControls(
-            modifier = Modifier
+            modifier = promptBounds?.let { bounds ->
+                val calloutTop = with(density) { (bounds.top.toDp() - 148.dp).coerceAtLeast(12.dp) }
+                Modifier.offset { IntOffset(0, with(density) { calloutTop.roundToPx() }) }
+            } ?: Modifier
                 .align(Alignment.BottomStart)
-                .padding(bottom = 54.dp),
+                .padding(bottom = 96.dp),
             text = "Tap the prompt to enter a command.",
             showHelpOnStart = showHelpOnStart,
             onShowHelpOnStartChange = onShowHelpOnStartChange,