Convert entity commands to use --facet option with SOL_FACET resolution
All entity commands (detect, attach, update, aka, observations, observe)
now accept facet as a --facet/-f option instead of a required positional
argument. When SOL_FACET is set in the environment, agents can omit it
entirely, matching the pattern established for --day across other call
modules.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>