lembas -l / --local: everything in the project, nothing written elsewhere

Config, data and state are rooted at <project>/.agent/local/lembas (or
.lembas/), kept out of git; a local directory the repository carries is
refused. The user's logins and connections.yaml are read, never written; the
user's config.yaml is not read. The TUI is started with TMPDIR inside it (the
compiled binary unpacks its native library there) and OpenTUI's cache goes
there too; the agent's commands keep the user's TMPDIR.

An instance serves models, chat, speech and the balance only: the link,
/remote, the service and the hub are off, deletes are not sent, and the server
library, search, fetch, embeddings and personalization are not used.
Self-update and uninstall are refused. hardline_disable is ignored, and tools
treat the local directory as outside the project.

The smoke test runs a whole local session in the compiled binary and checks
that HOME, the XDG directories and TMPDIR gained nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/tui/components/status.tsx

@@ -1,5 +1,6 @@
 import { basename } from "node:path"
 import { Show } from "solid-js"
+import { isLocal } from "../../config/paths.ts"
 import { useTui } from "../context.ts"
 
 const MODE_LABEL = { manual: "manual", edit: "edit", auto: "AUTO", plan: "plan" } as const
@@ -41,7 +42,9 @@ export function StatusBar(p: { mode: () => string; model: () => string; effort:
             <span style={{ fg: c().statusDim }}>{view.state.rate ? `${Math.round(view.state.rate)} tok/s · ` : ""}</span>
             <span style={{ fg: c().statusText }}>{p.credits?.() ? `${p.credits()} · ` : ""}</span>
             <span style={{ fg: ctx().color }}>{ctx().text}</span>
-            <span style={{ fg: c().statusDim }}> · {basename(app.project.root)}{p.branch ? `@${p.branch}` : ""}</span>
+            <span style={{ fg: c().statusDim }}> · </span>
+            <span style={{ fg: c().info }}>{isLocal() ? "local " : ""}</span>
+            <span style={{ fg: c().statusDim }}>{basename(app.project.root)}{p.branch ? `@${p.branch}` : ""}</span>
           </text>
         }
       >