style: use lowercase subtest names in test files

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Summary

Several test files use capitalized subtest names:

t.Run("Test GetByID", func(t *testing.T) { ... })
t.Run("Test FilterWithColumn", func(t *testing.T) { ... })

Go convention for t.Run() names is fully lowercase descriptive phrases:

t.Run("get by id", func(t *testing.T) { ... })
t.Run("filter with column", func(t *testing.T) { ... })

This reads more naturally in test output and follows the convention used in the standard library and most Go projects.

Affected Files

• examples/typed/query_test.go — 6 subtests
• examples/typed/filters/blacklist/iface_test.go
• examples/typed/filters/whitelist/iface_test.go
• examples/typed/filters/twolevel/iface_test.go
• examples/typed/filters/twolevel/nested/iface_test.go
• examples/typed/filters/pattern/iface_test.go

References

• Go Code Review Comments — Use of subtests