/code-review high on main..HEAD: the four commands that parse their own
arguments in prose (/trekbrief, /trekplan, /trekresearch, /trekexecute) lost
their --profile handling, and /trekresearch its --engine, so a typed value
became the path or the question. Each now strips a retired flag with its
value; the arg parser retires --profile only for the commands that had it
(not /trekendsession) and --engine for /trekresearch, seen red first.
Stale lines R-b left: architecture's hook row (9 scripts) and bridge agent,
the gap row's removed event ledger, README's contrarian marker, and a
dangling "also" in /trekexecute Phase 8.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>