fix(mcp): use bun instead of npx tsx for MCP servers

- bun run works more reliably for spawning child processes
- npx tsx has PATH issues when spawned as subprocess
- Enable all persona MCP servers by default

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.agent-core/agent-core.jsonc

@@ -12,18 +12,18 @@
     },
     "personas-memory": {
       "type": "local",
-      "command": ["npx", "tsx", "src/mcp/servers/memory.ts"],
-      "enabled": false
+      "command": ["bun", "run", "src/mcp/servers/memory.ts"],
+      "enabled": true
     },
     "personas-calendar": {
       "type": "local",
-      "command": ["npx", "tsx", "src/mcp/servers/calendar.ts"],
-      "enabled": false
+      "command": ["bun", "run", "src/mcp/servers/calendar.ts"],
+      "enabled": true
     },
     "personas-portfolio": {
       "type": "local",
-      "command": ["npx", "tsx", "src/mcp/servers/portfolio.ts"],
-      "enabled": false
+      "command": ["bun", "run", "src/mcp/servers/portfolio.ts"],
+      "enabled": true
     }
   },
   "tools": {

src/mcp/servers/index.ts

@@ -41,17 +41,17 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 export const PERSONA_MCP_SERVERS = {
   "personas-memory": {
     type: "local" as const,
-    command: ["npx", "tsx", join(__dirname, "memory.ts")],
+    command: ["bun", "run", join(__dirname, "memory.ts")],
     description: "Semantic memory storage and search via Qdrant",
   },
   "personas-calendar": {
     type: "local" as const,
-    command: ["npx", "tsx", join(__dirname, "calendar.ts")],
+    command: ["bun", "run", join(__dirname, "calendar.ts")],
     description: "Google Calendar integration for scheduling",
   },
   "personas-portfolio": {
     type: "local" as const,
-    command: ["npx", "tsx", join(__dirname, "portfolio.ts")],
+    command: ["bun", "run", join(__dirname, "portfolio.ts")],
     description: "Financial tools: portfolio, market data, SEC filings",
   },
 } as const;