Optimize test suite with testing.Short() guards

- Add Short() guards to slow CLI tests (2-4s each)
- Add Short() guards to slow API/integration tests (3-11s)
- Add Short() guard to hanging daemon discovery test (29s timeout)
- Short test suite now runs in ~6s (down from 5+ minutes)

Run 'go test -short ./...' for fast iteration
Run 'go test ./...' for full coverage

Closes: bd-iov0

internal/daemon/discovery_test.go

@@ -219,6 +219,9 @@ func TestDiscoverDaemons_Registry(t *testing.T) {
 }
 
 func TestDiscoverDaemons_Legacy(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping slow daemon discovery test in short mode")
+	}
 	tmpDir := t.TempDir()
 	beadsDir := filepath.Join(tmpDir, ".beads")
 	os.MkdirAll(beadsDir, 0755)