Function shared_plugin_state_hash 

pub fn shared_plugin_state_hash(info: &PluginInfo) -> u64

Resolve the state-envelope hash every format wrapper stamps into the saved blob. Today this is just hash_plugin_id(info.clap_id), which means the same plugin built as CLAP / VST3 / AU / AAX / VST2 / LV2 produces a single state space - saving in one host and loading in another will round-trip parameter values (provided the Plugin::save_state / load_state extra payload is also format-agnostic).

Trade-off: because the input is the CLAP ID, renaming info.clap_id invalidates every saved session across every format. Callers that want format-pinned state (e.g. an AU build that shouldn’t share state with the same plugin’s CLAP build) should add a per-format ID field to crate::PluginInfo and route through it instead.