Bridge protocol version constant (phase 0 of EDITOR_PLUGIN_PLAN.md).
Single source of truth for which protocol(s) this host supports.
Must stay in sync with src/install.rs::SUPPORTED_BRIDGE_PROTOCOLS.
(The Rust side is the compat-gating authority; this TS constant drives
the optional runtime warning in EditorPage.tsx.)
Bridge protocol version constant (phase 0 of EDITOR_PLUGIN_PLAN.md). Single source of truth for which protocol(s) this host supports. Must stay in sync with src/install.rs::SUPPORTED_BRIDGE_PROTOCOLS. (The Rust side is the compat-gating authority; this TS constant drives the optional runtime warning in EditorPage.tsx.)