chore: migrate from bun to pnpm + vitest + esbuild

- Replace bun:test with vitest across all packages
- Replace bun build with esbuild
- Replace bun:sqlite with better-sqlite3
- Fix OCAS Store API: store.put/get → store.cas.put/get
- Fix vitest vi.mock hoisting (vi.hoisted)
- Add pnpm-workspace.yaml and pnpm-lock.yaml
- Update all package.json test/build scripts

WIP: 8 failures remain in agent-hermes (bun engines check + sqlite migration)

Refs #26

packages/agent-claude-code/__tests__/claude-code.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test } from "bun:test";
+import { describe, expect, test } from 'vitest';
 import type { ThreadId } from "@united-workforce/protocol";
 import type { AgentContext } from "@united-workforce/util-agent";
 import { buildClaudeCodePrompt } from "../src/claude-code.js";

packages/agent-claude-code/__tests__/session-detail.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test } from "bun:test";
+import { describe, expect, test } from 'vitest';
 import { createMemoryStore, walk } from "@ocas/core";
 import {
   parseClaudeCodeJsonOutput,
@@ -278,7 +278,7 @@ describe("storeClaudeCodeDetail", () => {
     expect(output).toBe("The answer");
     expect(sessionId).toBe("abc-123");
 
-    const node = await store.get(detailHash);
+    const node = await store.cas.get(detailHash);
     expect(node).not.toBeNull();
     expect(node!.payload.model).toBe("claude-sonnet-4.5");
     expect(node!.payload.stopReason).toBe("end_turn");
@@ -286,7 +286,7 @@ describe("storeClaudeCodeDetail", () => {
     expect(node!.payload.turns).toHaveLength(2);
 
     // Verify turn CAS nodes
-    const turn0 = await store.get(node!.payload.turns[0]);
+    const turn0 = await store.cas.get(node!.payload.turns[0]);
     expect(turn0).not.toBeNull();
     expect(turn0!.payload.role).toBe("assistant");
     expect(turn0!.payload.content).toBe("hello");
@@ -466,7 +466,7 @@ describe("storeClaudeCodeDetail — incomplete results", () => {
     expect(output).toBe("Partial output");
     expect(sessionId).toBe("sess-incomplete");
 
-    const node = await store.get(detailHash);
+    const node = await store.cas.get(detailHash);
     expect(node).not.toBeNull();
     expect(node!.payload.subtype).toBe("incomplete");
     expect(node!.payload.stopReason).toBe("incomplete_no_result_line");
@@ -480,7 +480,7 @@ describe("storeClaudeCodeRawOutput", () => {
     const rawText = "Claude produced plain text without JSON";
     const hash = await storeClaudeCodeRawOutput(store, rawText);
     expect(hash).toHaveLength(13);
-    const node = await store.get(hash);
+    const node = await store.cas.get(hash);
     expect(node).not.toBeNull();
     expect(node!.payload.text).toBe(rawText);
   });

packages/agent-claude-code/package.json

@@ -12,20 +12,19 @@
   },
   "exports": {
     ".": {
-      "bun": "./src/index.ts",
       "types": "./dist/index.d.ts",
       "import": "./dist/index.js"
     }
   },
   "scripts": {
-    "prepublishOnly": "echo 'Use bun run release from repo root' && exit 1",
-    "test": "bun test __tests__/",
-    "test:ci": "bun test __tests__/"
+    "prepublishOnly": "echo 'Use pnpm run release from repo root' && exit 1",
+    "test": "vitest run __tests__/",
+    "test:ci": "vitest run __tests__/"
   },
   "dependencies": {
-    "@ocas/core": "^0.1.1",
-    "@united-workforce/util-agent": "workspace:^",
-    "@united-workforce/util": "workspace:^"
+    "@ocas/core": "^0.2.2",
+    "@united-workforce/util": "workspace:^",
+    "@united-workforce/util-agent": "workspace:^"
   },
   "devDependencies": {
     "typescript": "^5.8.3"

packages/agent-claude-code/src/session-detail.ts

@@ -290,7 +290,7 @@ export async function storeClaudeCodeDetail(
   // Store each turn as an individual CAS node
   const turnHashes: string[] = [];
   for (const turn of parsed.turns) {
-    const hash = await store.put(schemas.turn, turn);
+    const hash = await store.cas.put(schemas.turn, turn);
     turnHashes.push(hash);
   }
 
@@ -306,12 +306,12 @@ export async function storeClaudeCodeDetail(
     turns: turnHashes,
   };
 
-  const detailHash = await store.put(schemas.detail, detail);
+  const detailHash = await store.cas.put(schemas.detail, detail);
   return { detailHash, output: parsed.result, sessionId: parsed.sessionId };
 }
 
 /** Fallback: store raw text output when JSON parsing fails. */
 export async function storeClaudeCodeRawOutput(store: Store, rawOutput: string): Promise<string> {
   const schemas = await registerSchemas(store);
-  return store.put(schemas.rawOutput, { text: rawOutput });
+  return store.cas.put(schemas.rawOutput, { text: rawOutput });
 }