fix: keep sequential branch numbering beyond 999

Author: RbBtSn0w

scripts/bash/create-new-feature.sh

@@ -89,9 +89,9 @@ get_highest_from_specs() {
         for dir in "$specs_dir"/*; do
             [ -d "$dir" ] || continue
             dirname=$(basename "$dir")
-            # Only match sequential prefixes (###-*), skip timestamp dirs
-            if echo "$dirname" | grep -q '^[0-9]\{3\}-'; then
-                number=$(echo "$dirname" | grep -o '^[0-9]\{3\}')
+            # Match sequential prefixes (>=3 digits), but skip timestamp dirs.
+            if echo "$dirname" | grep -Eq '^[0-9]{3,}-' && ! echo "$dirname" | grep -Eq '^[0-9]{8}-[0-9]{6}-'; then
+                number=$(echo "$dirname" | grep -Eo '^[0-9]+')
                 number=$((10#$number))
                 if [ "$number" -gt "$highest" ]; then
                     highest=$number
@@ -115,9 +115,9 @@ get_highest_from_branches() {
             # Clean branch name: remove leading markers and remote prefixes
             clean_branch=$(echo "$branch" | sed 's/^[* ]*//; s|^remotes/[^/]*/||')
 
-            # Extract feature number if branch matches pattern ###-*
-            if echo "$clean_branch" | grep -q '^[0-9]\{3\}-'; then
-                number=$(echo "$clean_branch" | grep -o '^[0-9]\{3\}' || echo "0")
+            # Extract sequential feature number (>=3 digits), skip timestamp branches.
+            if echo "$clean_branch" | grep -Eq '^[0-9]{3,}-' && ! echo "$clean_branch" | grep -Eq '^[0-9]{8}-[0-9]{6}-'; then
+                number=$(echo "$clean_branch" | grep -Eo '^[0-9]+' || echo "0")
                 number=$((10#$number))
                 if [ "$number" -gt "$highest" ]; then
                     highest=$number

tests/test_timestamp_branches.py

@@ -147,6 +147,18 @@ def test_sequential_ignores_timestamp_dirs(self, git_repo: Path):
                 branch = line.split(":", 1)[1].strip()
         assert branch == "003-next-feat", f"expected 003-next-feat, got: {branch}"
 
+    def test_sequential_supports_four_digit_prefixes(self, git_repo: Path):
+        """Sequential numbering should continue past 999 without truncation."""
+        (git_repo / "specs" / "999-last-3digit").mkdir(parents=True)
+        (git_repo / "specs" / "1000-first-4digit").mkdir(parents=True)
+        result = run_script(git_repo, "--short-name", "next-feat", "Next feature")
+        assert result.returncode == 0, result.stderr
+        branch = None
+        for line in result.stdout.splitlines():
+            if line.startswith("BRANCH_NAME:"):
+                branch = line.split(":", 1)[1].strip()
+        assert branch == "1001-next-feat", f"expected 1001-next-feat, got: {branch}"
+
 
 # ── check_feature_branch Tests ───────────────────────────────────────────────