feat: session lifecycle wrapper with manifest capture and session logging

Refactor new/resume/open to use session.Run() which wraps child process launch with pre/post manifest capture and append-only session logging to logs/sessions.log. Bump version to 0.2.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cmd/new.go

@@ -5,14 +5,15 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/warrenronsiek/ctask/internal/config"
+	"github.com/warrenronsiek/ctask/internal/session"
 	"github.com/warrenronsiek/ctask/internal/shell"
 	"github.com/warrenronsiek/ctask/internal/workspace"
 )
 
 var newCmd = &cobra.Command{
-	Use:   "new [title]",
-	Short: "Create a new task workspace and launch the agent",
-	Long:  "Create a new task workspace and launch the agent. If title is omitted, generates task-HHMMSS.",
+	Use:          "new [title]",
+	Short:        "Create a new task workspace and launch the agent",
+	Long:         "Create a new task workspace and launch the agent. If title is omitted, generates task-HHMMSS.",
 	Args:         cobra.MaximumNArgs(1),
 	SilenceUsage: true,
 	RunE:         runNew,
@@ -28,7 +29,7 @@ var (
 
 func init() {
 	newCmd.Flags().StringVarP(&newCategory, "category", "c", "general", "Workspace category subdirectory")
-	newCmd.Flags().BoolVar(&newContainer, "container", false, "Launch in container sandbox (v0.2)")
+	newCmd.Flags().BoolVar(&newContainer, "container", false, "Launch in container sandbox (deferred)")
 	newCmd.Flags().BoolVar(&newShell, "shell", false, "Open interactive shell instead of agent")
 	newCmd.Flags().StringVarP(&newAgent, "agent", "a", "", "Command to exec as the agent")
 	newCmd.Flags().BoolVar(&newNoLaunch, "no-launch", false, "Create workspace only, do not launch")
@@ -72,14 +73,12 @@ func runNew(cmd *cobra.Command, args []string) error {
 
 	envVars := config.EnvVars(ws.Meta.Slug, ws.Meta.Mode, root, ws.Path, ws.Meta.Category)
 
-	if newShell {
-		return shell.ExecShell(ws.Path, envVars, ws.Meta.Slug, ws.Meta.Mode)
-	}
-
-	// Agent mode: print banner and exec
-	for _, line := range shell.BannerLines(ws.Meta.Mode, ws.Meta.Slug, ws.Path) {
-		fmt.Println(line)
-	}
-
-	return shell.ExecAgent(agent, ws.Path, envVars)
+	return session.Run(session.LaunchOpts{
+		WsDir:   ws.Path,
+		EnvVars: envVars,
+		Agent:   agent,
+		Mode:    ws.Meta.Mode,
+		Slug:    ws.Meta.Slug,
+		Shell:   newShell,
+	})
 }