Prepare the Bazel Central Registry entry as progmasoft_catch3

- MODULE.bazel names the module progmasoft_catch3, the name it has in
  the registry, with bazel_compatibility >=8.0.0; //tools:version finds
  the version under the new name.
- .bcr/ holds the templates publish-to-bcr fills: metadata, source (the
  GitHub archive of the catch3-* tag) and the presubmit, which runs the
  test module on Debian, Ubuntu, macOS (x86-64 and arm64) and Windows
  with Bazel 8.x and 9.x.
- tests/Progmasoft/BazelModule is a module that depends on Catch3 as a
  user's does, through //:catch3_main and through //:catch3 with its
  own main. The root ignores it; Bazel Builds tests it with Bazel 8.x
  and 9.x on Ubuntu and Windows.
- Publish to BCR runs when a catch3-* release is published, or by hand
  for a tag, and opens the registry pull request from the fork of the
  maintainer, without attestations.
- The integration guide says how a module depends on progmasoft_catch3.

Claude-Session: https://claude.ai/code/session_01Ji7xZMYjc4zankoc7hGBE1

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