Minimal v1 platform action surface for plugins, routed through the live
gateway adapter registry — the sanctioned alternative to monkeypatching an
adapter:
- ctx.platform_actions.add_reaction(platform, chat_id, message_id, emoji)
- ctx.platform_actions.set_thread_title(platform, chat_id, thread_id, title)
Gated behind a new 'gateway.platform_actions' capability in
CAPABILITY_REGISTRY (legacy key plugins.entries.<id>.allow_platform_actions,
default OFF), re-checked on every call via plugin_capability_granted (the
#84912 consent registry). Verbs validate the adapter exists and is connected,
return structured {ok, error, detail} results with stable error codes, and
never raise into hook dispatch. Every action is audit-logged with plugin id,
verb, platform, and outcome.
Telegram routes to _set_reaction / rename_dm_topic; Discord to
fetch_message().add_reaction / rename_thread. No adapter handles or raw SDK
objects are exposed.
Docs: plugins.md platform-actions section with the security note and the
explicit raw-SDK-not-shipped statement.
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