Update nuspec to place library under netnano1.0 TFM

[Copilot]

The nuspec was placing assembly files directly under lib\ with no target framework, and the dependency lacked a framework group — both incorrect for nanoFramework packages.

Changes

• Dependencies: Wrapped nanoFramework.CoreLibrary dependency in <group targetFramework=".NETnanoFramework1.0">
• Files: Replaced five individual file entries (dll, pdb, pdbx, pe, xml) with a single wildcard entry targeting lib\netnano1.0

<!-- Before -->
<dependencies>
  <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.35" />
</dependencies>
<files>
  <file src="...\nanoFramework.System.Collections.dll" target="lib\nanoFramework.System.Collections.dll" />
  <file src="...\nanoFramework.System.Collections.pdb" target="lib\nanoFramework.System.Collections.pdb" />
  <!-- ... 3 more explicit entries -->
</files>

<!-- After -->
<dependencies>
  <group targetFramework=".NETnanoFramework1.0">
    <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.35" />
  </group>
</dependencies>
<files>
  <file src="nanoFramework.System.Collections\bin\Release\nanoFramework.System.Collections.*" target="lib\netnano1.0" />
</files>

Pattern follows the System.Device.Adc reference.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update nuspec to place library under nano TFM</issue_title>
<issue_description>### Details about task
Most of the nuspec files are not using the correct location to place the files.
Files (DLL, PE, PDBX and XML for IntelliSense) should be placed under "lib\netnano1.0" (currently are being placed under "lib" only.
Also they should declare a dependency group for ".NETnanoFramework1.0" target framework.
At the same time those still naming the various file types should use a wildcard instead (e.g. "...\Release\mscorlib.*).
The correct pattern should be (take this nuspec as sample):
nanoframework/System.Device.Adc@aab7bca

Do not change anything else on the nuspec file.

Work from the DEVELOP branch.

Description

</issue_description>

Comments on the Issue (you are @copilot in this section)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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