Two halves of the same community report (dashboard Profile Builder):
1. A fresh dashboard/CLI-created profile got no .env file unless cloned,
so it silently inherited API keys and messaging tokens from the shell
environment / root install. create_profile() now seeds a placeholder
.env (0600) for non-clone profiles, matching the SOUL.md seeding.
2. The Channels endpoints (/api/messaging/platforms GET/PUT/test) were
not profile-scoped: they read/wrote the dashboard process's own .env
via load_env()/save_env_value() regardless of the global profile
switcher. They now accept the standard optional profile param (body
beats query on the PUT, matching other scoped writes) and run inside
_profile_scope(). When scoped, the payload no longer falls back to
os.environ or load_gateway_config()'s env-override layer — both carry
the ROOT install's credentials and would misreport them as the
profile's. /api/messaging/platforms added to PROFILE_SCOPED_PREFIXES
so the sidebar switcher scopes the Channels page automatically.
