Add docs/cli/ entries for:
transport_cli, discovery_cli, config_cli, protocol_cli, query_cli,
test_image_cli, xorg_cli, v4l2_view_cli, stream_send_cli,
stream_recv_cli, reconciler_cli, controller_cli
Each doc covers: description, build instructions, full usage with all
options and defaults, example output, and a relationship note pointing
to related tools. controller_cli includes the display control IDs table
and notes its temporary status.
README.md: convert all CLI tool entries to links.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
