perf: skip generated directories when resolving Java classes

[Pgns-bsb]

Summary

Skip common generated/build directories while discovering Java classes to avoid expensive filesystem traversal during auto-detection.

Why

Large projects often contain generated sources under folders such as build, out, target, and generated. Recursive scans were walking these directories even when they were not relevant, which slowed launch resolution and could trigger unnecessary package detection work.

Changes

• Skip generated, build, and IDE metadata directories during Java class lookup
• Add a regression test covering source-vs-generated class detection

Validation

• npm test -- --grep "ignores generated build directories"

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