Custom connections are gone: the CLI talks to the LLeMbas server it is logged in to

LLeMbas CLI 2.0 is LLeMbas-server-specific (CLI rule 2). Removed: the
anthropic, gemini, ollama and responses clients, context discovery and
llama-swap unloading (discover.ts), the Connection schema with its dialect,
auth, key_cmd, discover, unload_url and one_model_at_a_time, the model
`fallback` (it only ever moved to another server), effort_map and cache, and
the multi-connection refs. Kept: openai-chat, http, sse, think, effort,
tokens and all of src/lembas.

- connections.yaml holds the login (`type: webui`, as lembas login writes
  it). A custom entry from 1.x is read past with a warning that says how to
  log in, so an old file still starts; with several logins left, the latest
  is used and the others named.
- A model's ref is the id the server serves it under; the older forms
  (`<login>/<id>`, `<login>/<model>`) still resolve and config.yaml is
  rewritten once. Without a login there is no model, and the error (and the
  first-run screen, now the sign-in alone) says `lembas login <address>`.
- A login to another server signs this machine out of the previous one.
- The window is the server's word (no discovery); a capacity group comes
  from the server's `capacity.group` alone; embeddings use the server's
  /v1/embeddings.
- `lembas models` lists the server's models; install.sh's starter files, the
  README and the JSON schemas say the same.

Tests: every fixture is a login now (the fake server lists models, answers
other GETs with 404, and can hand one model to another script, as a server
with several backends); the dialect suites and the cross-connection tests are
gone with their code.

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

tests/acp.test.ts

@@ -36,7 +36,7 @@ function pair(): [Transport, Transport] {
 
 function config(url: string, extra = "") {
   mkdirSync(paths.config, { recursive: true })
-  writeFileSync(join(paths.config, "connections.yaml"), `connections:\n  f:\n    dialect: openai-chat\n    base_url: ${url}\n    models: { m: {} }\n`, { mode: 0o600 })
+  writeFileSync(join(paths.config, "connections.yaml"), `connections:\n  f:\n    type: webui\n    url: ${url}\n    models: { f/m: {} }\n`, { mode: 0o600 })
   writeFileSync(join(paths.config, "config.yaml"), `model: f/m\n${extra}`)
 }
 
@@ -210,19 +210,19 @@ test("_lembas/directories is for the link only: an editor's ACP session has no r
 test("the chat's model and effort: named by the instance, at the start and between prompts", async () => {
   fake = fakeProvider([{ chunks: [delta({ content: "one" })] }, { chunks: [delta({ content: "two" })] }])
   mkdirSync(paths.config, { recursive: true })
-  writeFileSync(join(paths.config, "connections.yaml"), `connections:\n  example:\n    dialect: openai-chat\n    base_url: ${fake.url}\n    models: { bonsai: {}, deepseek-flash: { efforts: [low, medium, high] } }\n`, { mode: 0o600 })
-  writeFileSync(join(paths.config, "config.yaml"), "model: example/bonsai\n")
+  writeFileSync(join(paths.config, "connections.yaml"), `connections:\n  example:\n    type: webui\n    url: ${fake.url}\n    models: { bonsai: {}, deepseek-flash: { efforts: [low, medium, high] } }\n`, { mode: 0o600 })
+  writeFileSync(join(paths.config, "config.yaml"), "model: bonsai\n")
   const root = project()
   const { c } = await client({ roots: [root], maxMode: "auto", approvalTimeoutMs: 50, requireTrust: true }, undefined, "example")
   // Not the device's own default: the model the chat was started on there.
   const s: any = await c.request("session/new", { cwd: root, _meta: { mode: "auto", lembas_model: "deepseek-flash", effort: "high" } })
-  expect(s._meta.lembas).toMatchObject({ model: "example/deepseek-flash", effort: "high" })
+  expect(s._meta.lembas).toMatchObject({ model: "deepseek-flash", effort: "high" })
   await c.request("session/prompt", { sessionId: s.sessionId, prompt: [{ type: "text", text: "hi" }] })
   expect(fake.requests[0].model).toBe("deepseek-flash")
   expect(JSON.stringify(fake.requests[0])).toContain('"reasoning_effort":"high"')
   // Changed in the web UI between two prompts.
   const changed: any = await c.request("_lembas/configure", { sessionId: s.sessionId, model: "bonsai", effort: "off" })
-  expect(changed).toEqual({ model: "example/bonsai", effort: "off" })
+  expect(changed).toEqual({ model: "bonsai", effort: "off" })
   await c.request("session/prompt", { sessionId: s.sessionId, prompt: [{ type: "text", text: "again" }] })
   expect(fake.requests.at(-1).model).toBe("bonsai")
   expect(JSON.stringify(fake.requests.at(-1))).not.toContain("reasoning_effort")