Changes

• Make hosted MCP config tools report request-backed hosted configuration instead of server-local config file paths.
• Resolve request-backed workspace slugs by calling Plane's workspace discovery endpoint with the client's passed credentials.
• Preserve hosted MCP credential pass-through while avoiding server-side credential storage.

Verification

• CI passed on main.
• Container publish passed for v0.2.3.
• Local validation passed: bunx vitest run test/mcp-server.test.ts, bun run test, bun run lint, bun run build.