A3: Expand assertions in SignatureTest

[LSantha]

Goal

Expand assertions in SignatureTest to cover all 6 test methods.

Source Under Test

• File: core/src/core/org/jnode/vm/classloader/Signature.java
• Class: org.jnode.vm.classloader.Signature
• Purpose: Method/field/class signature parsing

Current State

• Test file: core/src/test/org/jnode/test/SignatureTest.java
• Type: JUnit4
• Quality: low-assertion-density (6 methods, 3 assertions)
• Requires JNode: No (host JDK runnable)

Approach

1. Add assertions for parseMethodSignature, parseFieldSignature, parseClassSignature, getReturnType, getParameterTypes
2. Add to CoreTestSuite
3. Verify test compiles and passes

Acceptance Criteria

• Test class compiles
• sh build.sh tests exits 0
• JUnit XML report contains the test
• QEMU boot test passes
• PR opened against master

[LSantha]

/oc Please proceed with this task.

[opencode-agent]

Created PR #503

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