fix(agent): replace List.of() with Collections.emptyList() for Java 8 compatibility

[Copilot]

The codebase targets Java 8, but AgentManifestLibs.java used List.of() which was introduced in Java 9, causing compilation failures.

Changes:

• Replaced List.of() with Collections.emptyList() on lines 54 and 60
• Added Collections import

// Before (Java 9+)
return new ResolvedLibs(List.of(), List.of());

// After (Java 8 compatible)
return new ResolvedLibs(Collections.emptyList(), Collections.emptyList());

Both provide immutable empty lists with identical semantics.

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