Remove migrated caff and sort-in-place utilities

[codeforester]

Summary

Remove the caff and sort-in-place utility CLIs from Base now that they have been migrated to codeforester/base-platform-tools.

Rationale

Base should stay focused on workstation orchestration. These utilities are useful, but they are not part of Base's core control-plane surface.

The utilities now live in Base Platform Tools:

• codeforester/base-platform-tools#5

This Base cleanup keeps the product boundary clear:

• Base owns basectl, workspace orchestration, setup/check/doctor/test/run/demo/activate, manifests, and repository standards.
• Base Platform Tools owns optional utility CLIs such as caff and sort-in-place.

Scope

• Remove bin/caff.
• Remove bin/sort-in-place.
• Remove cli/bash/commands/caff/.
• Remove cli/bash/commands/sort-in-place/.
• Remove BATS workflow references for the migrated utility tests.
• Update Base docs and examples so caff and sort-in-place are no longer presented as Base-owned utilities.
• Add documentation pointers to codeforester/base-platform-tools where useful.
• Update the changelog.

Acceptance Criteria

• Base no longer exposes caff or sort-in-place as Base-owned commands.
• Base tests do not reference removed utility command directories.
• Documentation clearly says optional platform utilities live in Base Platform Tools.
• Base validation passes for the affected docs/tests.