Align level parity docs and fetch/status validation

- Add LevelsCompare.md with setup and validation comparisons against Gazler/githug.
- Document that LevelsCompare.md must be updated when level behavior changes.
- Track FETCH_HEAD count in RepoState so the Fetch level can match upstream validation.
- Mirror upstream Status setup with staged files plus untracked database.yml.
- Keep Fetch from being solved by pull despite native Git FETCH_HEAD behavior.
- Bump app version and build debug APK.

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

@@ -631,6 +631,11 @@ class GitRepositoryRuntime private constructor(
         val exactTagResult = runGit(nativeGit, sandbox, listOf("describe", "--tags", "--exact-match"))
         val userNameResult = runGit(nativeGit, sandbox, listOf("config", "--get", "user.name"))
         val userEmailResult = runGit(nativeGit, sandbox, listOf("config", "--get", "user.email"))
+        val fetchHeadCount = File(sandbox, ".git/FETCH_HEAD")
+            .takeIf { it.isFile }
+            ?.readLines()
+            ?.count { it.isNotBlank() }
+            ?: 0
         val config = buildMap {
             userNameResult.outputLines.firstOrNull()
                 ?.takeIf { userNameResult.exitCode == 0 && it.isNotBlank() }
@@ -704,6 +709,7 @@ class GitRepositoryRuntime private constructor(
                 .map { it.removePrefix("*").trim() }
                 .filter { it.isNotBlank() && " -> " !in it }
                 .toSet(),
+            fetchHeadCount = fetchHeadCount,
         )
     }
 
@@ -738,9 +744,8 @@ class GitRepositoryRuntime private constructor(
                 stashes = mergeDistinct(previousRepo.stashes, inspectedRepo.stashes + "stash@{${previousRepo.stashes.size}}"),
             )
             "fetch" -> {
-                val remote = tokens.getOrNull(2)?.takeIf { !it.startsWith("-") } ?: "origin"
                 inspectedRepo.copy(
-                    fetchedBranches = inspectedRepo.fetchedBranches + previousRepo.fetchedBranches + "$remote/master" + "$remote/feature_branch" + "$remote/new_branch",
+                    fetchedBranches = inspectedRepo.fetchedBranches + previousRepo.fetchedBranches,
                     maintenanceActions = inspectedRepo.maintenanceActions + previousRepo.maintenanceActions + "fetch",
                 )
             }
@@ -749,6 +754,8 @@ class GitRepositoryRuntime private constructor(
                 val branch = tokens.drop(2).lastOrNull()?.takeIf { !it.startsWith("-") && it != remote } ?: inspectedRepo.headBranch
                 inspectedRepo.copy(
                     fetchedBranches = inspectedRepo.fetchedBranches + previousRepo.fetchedBranches + "$remote/$branch",
+                    fetchHeadCount = inspectedRepo.fetchHeadCount,
+                    maintenanceActions = inspectedRepo.maintenanceActions + previousRepo.maintenanceActions + "pull",
                 )
             }
             "push" -> {
@@ -795,6 +802,7 @@ class GitRepositoryRuntime private constructor(
             else -> inspectedRepo.copy(
                 stashes = mergeDistinct(previousRepo.stashes, inspectedRepo.stashes),
                 fetchedBranches = previousRepo.fetchedBranches + inspectedRepo.fetchedBranches,
+                fetchHeadCount = inspectedRepo.fetchHeadCount,
                 pushedBranches = previousRepo.pushedBranches + inspectedRepo.pushedBranches,
                 pushedTags = previousRepo.pushedTags + inspectedRepo.pushedTags,
                 submodules = previousRepo.submodules + inspectedRepo.submodules,