pub fn parse_key_env(s: &str) -> Result<Option<[u8; 32]>, String>Expand description
Parse an MCP_ENCRYPTION_KEY env-var value: a single base64-encoded
32-byte key. Empty string → None. Malformed → Err.
Retained as a no-op compatibility shim: the proxy no longer encrypts session ids (they’re plain UUIDs now), but the API crate still parses and forwards the configured key. Kept so that the env plumbing in the API/CLI compiles unchanged; the parsed value is ignored by the proxy. Removal is deferred to a later step of the session-id refactor.