The salvaged flag was spelled --profile, which collides with the global
-p/--profile that hermes_cli.main scans BEFORE argparse: `hermes webhook
subscribe x --profile compta` would switch this CLI process to compta's
HERMES_HOME and write the subscription into compta's webhook_subscriptions.json
— a file the default gateway's webhook adapter never reads — while the route
still lacked the profile key. #109020 special-cased the scanner for the webhook
subcommand; naming the flag --route-profile removes the ambiguity without
touching _scan_profile_flag: -p picks the gateway whose subscriptions file is
written, --route-profile picks which /p/<profile>/ prefix may hit the route.
Docs: cli-commands reference row, multi-profile-gateways webhook section, the
route `profile` field. Builds on #109020 (fangliquanflq). Fixes#109016.
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