Treat gitfile .git as out of scope (worktree/submodule)

A regular-file .git is a worktree or submodule pointer (gitfile), not a
real gitdir we should relocate. Skip it in all three hooks (-L || -f) and
short-circuit cleanly in the relocator instead of tripping the
not-a-directory assertion. Widen that assertion's wording accordingly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: bukzor

.local/share/git-localhost-store/bin/git-localhost-store

@@ -21,8 +21,14 @@ if [ -L .git ]; then
     exit 0
 fi
 
+if [ -f .git ]; then
+    gitfile="$(cat .git)"
+    echo "git-localhost-store: ✓ Gitfile (worktree/submodule), out of scope: $gitfile" >&2
+    exit 0
+fi
+
 if [ ! -d .git ]; then
-    echo "❌ .git is not a directory (got: $(ls -ld .git 2>&1))" >&2
+    echo "git-localhost-store: ❌ .git is not a directory, symlink, or gitfile (got: $(ls -ld .git 2>&1))" >&2
     exit 1
 fi
 

.local/share/git-localhost-store/template-repo/hooks/post-index-change

@@ -9,7 +9,8 @@ if (( DEBUG > 0 )); then
   : post-index-change "$@"
 fi
 
-if [ -L .git ]; then
+if [ -L .git ] || [ -f .git ]; then
+  : Nothing to convert.
   exit 0
 fi
 

.local/share/git-localhost-store/template-repo/hooks/pre-commit

@@ -9,7 +9,8 @@ if (( DEBUG > 0 )); then
   : pre-commit "$@"
 fi
 
-if [ -L .git ]; then
+if [ -L .git ] || [ -f .git ]; then
+  : Nothing to convert.
   exit 0
 fi
 

.local/share/git-localhost-store/template-repo/hooks/reference-transaction

@@ -14,8 +14,8 @@ if [[ "${1:-}" != "committed" ]]; then
   exit 0
 fi
 
-# Already converted: .git is a symlink, not a real directory.
-if [ -L .git ]; then
+if [ -L .git ] || [ -f .git ]; then
+  : Nothing to convert.
   exit 0
 fi