fix(orphan): handle prefixes with dots in orphan detection (GH#508)

The orphan detection was incorrectly flagging issues with dots in their
prefix (e.g., "my.project-abc123") as orphans because it was looking for
any dot in the ID, treating everything before the first dot as the
parent ID.

The fix:
- Add IsHierarchicalID() helper that correctly detects hierarchical IDs
  by checking if the ID ends with .{digits} (e.g., "bd-abc.1")
- Update SQL query in orphan detection migration to use GLOB patterns
  that only match IDs ending with numeric suffixes
- Update all Go code that checks for hierarchical IDs to use the new
  helper function

Test cases added:
- Unit tests for IsHierarchicalID covering normal, dotted prefix, and
  edge cases
- Integration test verifying dotted prefixes do not trigger false
  positives

Fixes: #508

internal/storage/sqlite/queries.go

@@ -122,7 +122,8 @@ func (s *SQLiteStorage) CreateIssue(ctx context.Context, issue *types.Issue, act
 		}
 
 		// For hierarchical IDs (bd-a3f8e9.1), ensure parent exists
-		if strings.Contains(issue.ID, ".") {
+		// Use IsHierarchicalID to correctly handle prefixes with dots (GH#508)
+		if isHierarchical, parentID := IsHierarchicalID(issue.ID); isHierarchical {
 			// Try to resurrect entire parent chain if any parents are missing
 			// Use the conn-based version to participate in the same transaction
 			resurrected, err := s.tryResurrectParentChainWithConn(ctx, conn, issue.ID)
@@ -131,8 +132,6 @@ func (s *SQLiteStorage) CreateIssue(ctx context.Context, issue *types.Issue, act
 			}
 			if !resurrected {
 				// Parent(s) not found in JSONL history - cannot proceed
-				lastDot := strings.LastIndex(issue.ID, ".")
-				parentID := issue.ID[:lastDot]
 				return fmt.Errorf("parent issue %s does not exist and could not be resurrected from JSONL history", parentID)
 			}
 		}