BDE tools defaults to an un-optimized build, which is atypical

Simply running `bbs_build_env` sets the environment to subsequently configure a build to be unoptimized, but with debug symbols. In my experience, this is atypical with open-source software. Most open source packages default to build with optimizations; the user must manually elect to perform a "debug build". Defaulting to an optimized build may align software built with the BDE build system better to open source expectations.

Start at the bbs_build_env entry point and trace how it selects optimization and debug defaults for subsequent configuration. Confirm the intended default with the project’s build behavior, then verify that a normal environment uses optimization while an explicit debug choice still works.

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