feat(named-agents): sidebar view, synthetic provider, auto-save, snapshot semantics

Implement the frontend of the Named Agents feature (plan §5-§9):
- New features/named-agents module: pure logic (types re-exported from
  @dispatch/wire + transport-contract, validation, provider/model options,
  snapshot helpers, network normalizers, auto-save status model) + an injected
  auto-save controller (name debounce, immediate provider/model save, monotonic
  stale-response guard) + the collapsible sidebar card view.
- Store: /named-agents CRUD + boot seed; selectModel(model, snapshot?) persists
  the raw model WITH the namedAgent snapshot; draft promotion carries it;
  refreshModel restores ModelResponse.namedAgent.
- Chat store setNamedAgent (sends namedAgent on chat.send); Tab.snapshot +
  setSnapshot (retained across rename/remove, persisted with tabs).
- Model selector: synthetic Named Agents provider ALWAYS first; selecting one
  resolves to the raw model + records a snapshot; a retained snapshot of a
  renamed/removed agent still displays as unavailable (plan §7).
- Composition root wires the view (viewKinds + loaded-modules manifest) + feeds
  the selector.

Tests: logic + controller + selector + app-store CRUD (1246 pass), typecheck 0,
biome clean (only pre-existing config infos pending a future migrate), build OK.

1 files changed, 72 insertions, 0 deletions

diff --git a/src/features/named-agents/logic/options.test.ts b/src/features/named-agents/logic/options.test.ts
new file mode 100644
index 0000000..8b774ab
--- /dev/null
+++ b/src/features/named-agents/logic/options.test.ts
@@ -0,0 +1,72 @@
+import { describe, expect, it } from "vitest";
+import {
+  fullModelFromSelection,
+  modelFromFull,
+  modelsForProvider,
+  providerFromModel,
+  providerLabel,
+  providerOptions,
+} from "./options";
+
+const MODELS = [
+  "opencode-2/gpt-5",
+  "opencode-1/claude-sonnet-4.5",
+  "umans/umans-glm-5.2",
+  "opencode-10/defiant",
+  "umans/umans-gpt-5",
+  "hyper/fast-1",
+] as const;
+
+describe("providerFromModel / modelFromFull", () => {
+  it("splits a <provider>/<model> on the first slash", () => {
+    expect(providerFromModel("opencode-1/claude-sonnet-4.5")).toBe("opencode-1");
+    expect(modelFromFull("opencode-1/claude-sonnet-4.5")).toBe("claude-sonnet-4.5");
+  });
+
+  it("treats a slashless name as all-provider", () => {
+    expect(providerFromModel("umans")).toBe("umans");
+    expect(modelFromFull("umans")).toBe("");
+  });
+});
+
+describe("providerOptions", () => {
+  it("sorts numbered OpenCode credentials numerically before other providers", () => {
+    expect(providerOptions([...MODELS])).toEqual([
+      "opencode-1",
+      "opencode-2",
+      "opencode-10",
+      "umans",
+      "hyper",
+    ]);
+  });
+
+  it("keeps first-seen order and dedupes", () => {
+    expect(providerOptions(["b/x", "a/y", "b/z"])).toEqual(["b", "a"]);
+  });
+});
+
+describe("modelsForProvider", () => {
+  it("returns only the model suffixes under the provider, in order", () => {
+    expect(modelsForProvider([...MODELS], "umans")).toEqual(["umans-glm-5.2", "umans-gpt-5"]);
+    expect(modelsForProvider([...MODELS], "hyper")).toEqual(["fast-1"]);
+  });
+
+  it("returns [] for an unknown provider", () => {
+    expect(modelsForProvider([...MODELS], "missing")).toEqual([]);
+  });
+});
+
+describe("providerLabel", () => {
+  it("labels numbered OpenCode providers, leaves others unchanged", () => {
+    expect(providerLabel("opencode-2")).toBe("OpenCode #2");
+    expect(providerLabel("umans")).toBe("umans");
+  });
+});
+
+describe("fullModelFromSelection", () => {
+  it("recombines a provider + model suffix", () => {
+    expect(fullModelFromSelection("opencode-1", "claude-sonnet-4.5")).toBe(
+      "opencode-1/claude-sonnet-4.5",
+    );
+  });
+});