fix: orphan detection false positive with dots in directory name

Only treat issue IDs as hierarchical (parent.child) when the dot appears
AFTER the first hyphen. This prevents false positives when the project
directory name contains a dot (e.g., "my.project-abc123" was incorrectly
being treated as having parent "my").

Fixes GH#508

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/sqlite/ids.go

@@ -202,8 +202,13 @@ func EnsureIDs(ctx context.Context, conn *sql.Conn, prefix string, issues []*typ
 				}
 			}
 			
-			// For hierarchical IDs (bd-a3f8e9.1), ensure parent exists
-			if strings.Contains(issues[i].ID, ".") {
+			// For hierarchical IDs (prefix-hash.child), ensure parent exists
+			// Only consider dots that appear AFTER the first hyphen (the prefix-hash separator)
+			// This avoids false positives when the prefix itself contains dots (e.g., "my.project-abc")
+			// See GH#508
+			hyphenIdx := strings.Index(issues[i].ID, "-")
+			hasHierarchicalDot := hyphenIdx >= 0 && strings.Contains(issues[i].ID[hyphenIdx+1:], ".")
+			if hasHierarchicalDot {
 				// Extract parent ID (everything before the last dot)
 				lastDot := strings.LastIndex(issues[i].ID, ".")
 				parentID := issues[i].ID[:lastDot]