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/resume.go

@@ -7,6 +7,7 @@ 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"
 )
@@ -26,20 +27,25 @@ var (
 )
 
 func init() {
-	resumeCmd.Flags().BoolVar(&resumeContainer, "container", false, "Resume in container mode (v0.2)")
+	resumeCmd.Flags().BoolVar(&resumeContainer, "container", false, "Resume in container mode (deferred)")
 	resumeCmd.Flags().BoolVar(&resumeShell, "shell", false, "Open shell instead of agent")
 	resumeCmd.Flags().StringVarP(&resumeAgent, "agent", "a", "", "Override agent command")
 	rootCmd.AddCommand(resumeCmd)
 }
 
 func runResume(cmd *cobra.Command, args []string) error {
-	if resumeContainer {
+	return doResume(args[0], resumeContainer, resumeShell, resumeAgent)
+}
+
+// doResume is the shared resume logic used by both resume and last commands.
+func doResume(query string, container, useShell bool, agentOverride string) error {
+	if container {
 		fmt.Println(shell.ContainerNotice())
 		return nil
 	}
 
 	root := config.ResolveRoot()
-	ws := resolveOne(root, args[0], false)
+	ws := resolveOne(root, query, false)
 
 	// Update updated_at
 	now := time.Now().UTC().Truncate(time.Second)
@@ -49,21 +55,19 @@ func runResume(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("updating metadata: %w", err)
 	}
 
-	agent := resumeAgent
+	agent := agentOverride
 	if agent == "" {
 		agent = ws.Meta.Agent
 	}
 
 	envVars := config.EnvVars(ws.Meta.Slug, ws.Meta.Mode, root, ws.Path, ws.Meta.Category)
 
-	if resumeShell {
-		return shell.ExecShell(ws.Path, envVars, ws.Meta.Slug, ws.Meta.Mode)
-	}
-
-	// Agent mode
-	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:   useShell,
+	})
 }