feat(v0.4.1): add seed directory checks to ctask doctor

Replaces the always-informational seed-dir block with three-state checks:
INFO when the env var is unset (defaults will be used), PASS when set and
the path exists, FAIL when set but the directory is missing. Only the
configured-but-missing state counts as a failed check and raises the
doctor exit code.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/doctor.go

@@ -178,23 +178,27 @@ func runDoctor(cmd *cobra.Command, args []string) error {
 		failed++
 	}
 
-	// Informational checks (do not affect pass/fail counters).
-	fmt.Println()
-	fmt.Println("Seed directories (informational):")
-
-	seedDir := config.ResolveSeedDir()
-	if info, err := os.Stat(seedDir); err == nil && info.IsDir() {
-		fmt.Printf("  [INFO] General seed directory: %s (present)\n", seedDir)
-	} else {
-		fmt.Printf("  [INFO] General seed directory: %s (not present)\n", seedDir)
-	}
-
-	projectSeedDir := config.ResolveProjectSeedDir()
-	if info, err := os.Stat(projectSeedDir); err == nil && info.IsDir() {
-		fmt.Printf("  [INFO] Project seed directory: %s (present)\n", projectSeedDir)
-	} else {
-		fmt.Printf("  [INFO] Project seed directory: %s (not present)\n", projectSeedDir)
-	}
+	// Checks 6 + 7: Seed directory configuration.
+	// Three states per variable:
+	//   - env not set          -> informational (built-in defaults will be used)
+	//   - env set, path exists -> pass
+	//   - env set, path missing -> fail
+	checkSeedDir(
+		"General seed directory",
+		os.Getenv("CTASK_SEED_DIR"),
+		config.ResolveSeedDir(),
+		"CTASK_SEED_DIR",
+		&passed,
+		&failed,
+	)
+	checkSeedDir(
+		"Project seed directory",
+		os.Getenv("CTASK_SEED_PROJECT_DIR"),
+		config.ResolveProjectSeedDir(),
+		"CTASK_SEED_PROJECT_DIR",
+		&passed,
+		&failed,
+	)
 
 	// Summary
 	fmt.Println()
@@ -205,3 +209,23 @@ func runDoctor(cmd *cobra.Command, args []string) error {
 	}
 	return nil
 }
+
+// checkSeedDir prints one of the three seed-directory doctor states.
+// envValue is the raw value of the CTASK_SEED_* variable (empty means unset).
+// resolved is the absolute path returned by the config resolver (used only
+// when envValue is non-empty; for the "not configured" state the built-in
+// default path is not displayed).
+func checkSeedDir(label, envValue, resolved, envName string, passed, failed *int) {
+	if envValue == "" {
+		fmt.Printf("  [INFO] %s: not configured (using built-in defaults)\n", label)
+		return
+	}
+	if info, err := os.Stat(resolved); err == nil && info.IsDir() {
+		fmt.Printf("  [PASS] %s: %s\n", label, resolved)
+		*passed++
+		return
+	}
+	fmt.Printf("  [FAIL] %s configured but not found: %s\n", label, resolved)
+	fmt.Printf("         Fix: create the directory or unset %s to use built-in defaults.\n", envName)
+	*failed++
+}