session: rename Agent.uname → Agent.id

The agent's identity field is its id, not a Unix username.
Config.Uname preserved as public API (renamed with 9P recraft).

session/agent.go

@@ -31,7 +31,7 @@ type Agent struct {
 	state    string // "idle", "thinking", "calling: <tool>"
 	reply    string // last assistant response
 	cwd      string // working directory for tool execution
-	uname    string // agent principal (numeric UID for 9P identity)
+	id       string // agent identity (unique principal)
 	fifo     Fifo   // prompt queue
 	toolCallCount atomic.Int64
 	pendingInject atomic.Pointer[string]

session/commands.go

@@ -175,7 +175,7 @@ func (a *Session) handleCommand(ctx context.Context, input string) bool {
 				return
 			}
 			d := a.r.newDispatcher()
-			env := []string{"OLLIE_SESSION_ID=" + a.id, "OLLIE_UNAME=" + a.r.uname}
+			env := []string{"OLLIE_SESSION_ID=" + a.id, "OLLIE_UNAME=" + a.r.id}
 			env = append(env, a.r.promptEnvExtra...)
 			rt := BuildRuntime(cfg, d, a.r.cwd, env, a.r.baseLayers...)
 			if rt.CfgBackend != "" {

session/session.go

@@ -365,8 +365,8 @@ func (a *Session) pushSessionEnv() {
 	if srv, ok := a.r.runtime.Dispatcher.GetServer("execute"); ok {
 		if es, ok := srv.(tools.EnvSetter); ok {
 			es.SetEnv("OLLIE_SESSION_ID", a.id)
-			if a.r.uname != "" {
-				es.SetEnv("OLLIE_UNAME", a.r.uname)
+			if a.r.id != "" {
+				es.SetEnv("OLLIE_UNAME", a.r.id)
 			}
 		}
 	}
@@ -464,6 +464,7 @@ func New(cfg Config) *Session {
 			history:        cfg.History,
 			runtime:        rt,
 			cwd:            paths.ExpandHome(cfg.CWD),
+			id:             cfg.Uname,
 			agentName:      cfg.AgentName,
 			agentsDir:      cfg.AgentsDir,
 			promptEnvExtra: cfg.PromptEnvExtra,