fix(init): update output to show hash-based ID format

The bd init and quickstart commands displayed outdated ID format
examples showing sequential IDs (prefix-1, prefix-2, ...) but beads
has used content-based hash IDs since bd-8e05.

Updated output now correctly shows:
  Issues will be named: prefix-<hash> (e.g., prefix-a3f2dd)

This matches the actual GenerateHashID implementation in
internal/types/id_generator.go which generates 6-8 char hex hashes.



test(init): update test expectations to match hash-based ID format

Tests were checking for the old sequential format (prefix-1, prefix-2)
but the code now outputs hash-based format (prefix-<hash>).

Co-authored-by: cc-vps <crcatala+vps@gmail.com>

cmd/bd/init_test.go

@@ -27,7 +27,7 @@ func TestInitCommand(t *testing.T) {
 			name:           "init with custom prefix",
 			prefix:         "myproject",
 			quiet:          false,
-			wantOutputText: "myproject-1, myproject-2",
+			wantOutputText: "myproject-<hash>",
 		},
 		{
 			name:         "init with quiet flag",
@@ -39,7 +39,7 @@ func TestInitCommand(t *testing.T) {
 			name:           "init with prefix ending in hyphen",
 			prefix:         "test-",
 			quiet:          false,
-			wantOutputText: "test-1, test-2",
+			wantOutputText: "test-<hash>",
 		},
 	}