fix: create boot directory on install and make fixable

- Add boot directory creation to install.go (avoids warning on fresh install)
- Make boot-health check fixable via 'gt doctor --fix'
- Update FixHint to reference the fix command

internal/cmd/install.go

@@ -221,6 +221,13 @@ func runInstall(cmd *cobra.Command, args []string) error {
 		fmt.Printf("   ✓ Created deacon/.claude/settings.json\n")
 	}
 
+	// Create boot directory (deacon/dogs/boot/) for Boot watchdog.
+	// This avoids gt doctor warning on fresh install.
+	bootDir := filepath.Join(deaconDir, "dogs", "boot")
+	if err := os.MkdirAll(bootDir, 0755); err != nil {
+		fmt.Printf("   %s Could not create boot directory: %v\n", style.Dim.Render("⚠"), err)
+	}
+
 	// Initialize git BEFORE beads so that bd can compute repository fingerprint.
 	// The fingerprint is required for the daemon to start properly.
 	if installGit || installGitHub != "" {

internal/doctor/boot_check.go

@@ -11,20 +11,37 @@ import (
 // BootHealthCheck verifies Boot watchdog health.
 // "The vet checks on the dog."
 type BootHealthCheck struct {
-	BaseCheck
+	FixableCheck
+	missingDir bool // track if directory is missing for Fix()
 }
 
 // NewBootHealthCheck creates a new Boot health check.
 func NewBootHealthCheck() *BootHealthCheck {
 	return &BootHealthCheck{
-		BaseCheck: BaseCheck{
-			CheckName:        "boot-health",
-			CheckDescription: "Check Boot watchdog health (the vet checks on the dog)",
-			CheckCategory:    CategoryInfrastructure,
+		FixableCheck: FixableCheck{
+			BaseCheck: BaseCheck{
+				CheckName:        "boot-health",
+				CheckDescription: "Check Boot watchdog health (the vet checks on the dog)",
+				CheckCategory:    CategoryInfrastructure,
+			},
 		},
 	}
 }
 
+// CanFix returns true only if the directory is missing (we can create it).
+func (c *BootHealthCheck) CanFix() bool {
+	return c.missingDir
+}
+
+// Fix creates the missing boot directory.
+func (c *BootHealthCheck) Fix(ctx *CheckContext) error {
+	if !c.missingDir {
+		return nil
+	}
+	b := boot.New(ctx.TownRoot)
+	return b.EnsureDir()
+}
+
 // Run checks Boot health: directory, session, status, and marker freshness.
 func (c *BootHealthCheck) Run(ctx *CheckContext) *CheckResult {
 	b := boot.New(ctx.TownRoot)
@@ -33,12 +50,13 @@ func (c *BootHealthCheck) Run(ctx *CheckContext) *CheckResult {
 	// Check 1: Boot directory exists
 	bootDir := b.Dir()
 	if _, err := os.Stat(bootDir); os.IsNotExist(err) {
+		c.missingDir = true
 		return &CheckResult{
 			Name:    c.Name(),
 			Status:  StatusWarning,
 			Message: "Boot directory not present",
 			Details: []string{fmt.Sprintf("Expected: %s", bootDir)},
-			FixHint: "Boot directory is created on first daemon run",
+			FixHint: "Run 'gt doctor --fix' to create it",
 		}
 	}