Add ServerAdapterModule capabilities from fork's adapter-utils 0.3.1

Bring the K8s adapter up to parity with the fork's ServerAdapterModule
contract by adding sessionManagement, listSkills/syncSkills, listModels
with Bedrock detection, and promptBundleKey support in the session codec.

- Declare sessionManagement with nativeContextManagement: "confirmed"
  so Paperclip skips threshold-based session compaction (Claude manages
  its own context)
- Add ephemeral skill management (listSkills/syncSkills) mirroring
  claude_local — reports skill state without runtime persistence since
  skills are injected via prompt bundle into ephemeral Job pods
- Add listModels() with Bedrock environment detection, returning
  region-qualified model IDs when CLAUDE_CODE_USE_BEDROCK or
  ANTHROPIC_BEDROCK_BASE_URL are set
- Extend session codec to round-trip promptBundleKey field
- Remove the `as ServerAdapterModule` cast — the return type now
  satisfies the full interface

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/models.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import { listK8sModels } from "./models.js";
+
+describe("listK8sModels", () => {
+  const savedEnv: Record<string, string | undefined> = {};
+
+  beforeEach(() => {
+    savedEnv.CLAUDE_CODE_USE_BEDROCK = process.env.CLAUDE_CODE_USE_BEDROCK;
+    savedEnv.ANTHROPIC_BEDROCK_BASE_URL = process.env.ANTHROPIC_BEDROCK_BASE_URL;
+    delete process.env.CLAUDE_CODE_USE_BEDROCK;
+    delete process.env.ANTHROPIC_BEDROCK_BASE_URL;
+  });
+
+  afterEach(() => {
+    for (const [key, value] of Object.entries(savedEnv)) {
+      if (value === undefined) delete process.env[key];
+      else process.env[key] = value;
+    }
+  });
+
+  it("returns direct API models by default", async () => {
+    const models = await listK8sModels();
+    expect(models.some((m) => m.id === "claude-opus-4-6")).toBe(true);
+    expect(models.every((m) => !m.id.includes("anthropic."))).toBe(true);
+  });
+
+  it("returns Bedrock models when CLAUDE_CODE_USE_BEDROCK=1", async () => {
+    process.env.CLAUDE_CODE_USE_BEDROCK = "1";
+    const models = await listK8sModels();
+    expect(models.some((m) => m.id.includes("anthropic."))).toBe(true);
+    expect(models.every((m) => !m.id.startsWith("claude-"))).toBe(true);
+  });
+
+  it("returns Bedrock models when CLAUDE_CODE_USE_BEDROCK=true", async () => {
+    process.env.CLAUDE_CODE_USE_BEDROCK = "true";
+    const models = await listK8sModels();
+    expect(models.some((m) => m.id.includes("anthropic."))).toBe(true);
+  });
+
+  it("returns Bedrock models when ANTHROPIC_BEDROCK_BASE_URL is set", async () => {
+    process.env.ANTHROPIC_BEDROCK_BASE_URL = "https://bedrock.us-east-1.amazonaws.com";
+    const models = await listK8sModels();
+    expect(models.some((m) => m.id.includes("anthropic."))).toBe(true);
+  });
+
+  it("ignores blank ANTHROPIC_BEDROCK_BASE_URL", async () => {
+    process.env.ANTHROPIC_BEDROCK_BASE_URL = "   ";
+    const models = await listK8sModels();
+    expect(models.some((m) => m.id === "claude-opus-4-6")).toBe(true);
+  });
+});