Remove documentation for unavailable tool-search command (#3162)

* fix(cli): register tool search command

Wire the documented tool-search subcommand to the existing discovery engine and configured inventory.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* docs: remove unavailable tool-search command

Remove the CLI section that advertised a subcommand the binary does not provide.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: f1d58829-0794-4caa-aa18-86543d177609

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f1d58829-0794-4caa-aa18-86543d177609