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.ts

@@ -0,0 +1,21 @@
+import type { AdapterModel } from "@paperclipai/adapter-utils";
+import { models as DIRECT_MODELS } from "../index.js";
+
+const BEDROCK_MODELS: AdapterModel[] = [
+  { id: "us.anthropic.claude-opus-4-6-v1", label: "Bedrock Opus 4.6" },
+  { id: "us.anthropic.claude-sonnet-4-5-20250929-v2:0", label: "Bedrock Sonnet 4.5" },
+  { id: "us.anthropic.claude-haiku-4-5-20251001-v1:0", label: "Bedrock Haiku 4.5" },
+];
+
+function isBedrockEnv(): boolean {
+  return (
+    process.env.CLAUDE_CODE_USE_BEDROCK === "1" ||
+    process.env.CLAUDE_CODE_USE_BEDROCK === "true" ||
+    (typeof process.env.ANTHROPIC_BEDROCK_BASE_URL === "string" &&
+      process.env.ANTHROPIC_BEDROCK_BASE_URL.trim().length > 0)
+  );
+}
+
+export async function listK8sModels(): Promise<AdapterModel[]> {
+  return isBedrockEnv() ? BEDROCK_MODELS : DIRECT_MODELS;
+}