Secondary profiles under gateway multiplex keep tokens/allowlists in
profile secret_scope, not process os.environ. Auth and Slack were still
reading os.getenv, so Slack on a secondary profile failed allowlist and
socket mode. Webhook deliver also only looked at default adapters.
- Prefer get_secret for allowlists / allow-all flags (authz_mixin)
- Slack app token + allowlist via secret_scope with getenv fallback
- Wrap secondary profile message handlers in _profile_runtime_scope
before auth runs
- Resolve home-channel env from secret_scope / PlatformConfig
- Webhook deliver falls back to _profile_adapters for target platform
- Template key event_type for webhook prompts
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