The magic MCP wiring left with BDR-093; this removes the prose that still
described it: gitleaks allowlist note, Step 8.7 header, plugins.lock note,
profile.sh comments and the usage() NOTE that still claimed `set` toggles
"the magic MCP", the managed-set test header, README (one history sentence
kept; MCP-era risk paragraph and the retired bashrc wrapper claim dropped).
.env.example carries the same scrub in the working tree; staging it is
denied to the agent (`git add .env*`), the user stages it.