Method is_session_envelope

atomic-agent/src/envelope.rs:310–312

Check whether a byte slice looks like a `SessionEnvelope`. This is a fast check (just the 4-byte magic prefix) that the server can use to identify which changes have session data without fully deserializing. Used during push receipt to index session turns. # Example ```rust use atomic_agent::envelope::SessionEnvelope; let envelope = SessionEnvelope::builder("s1", "claude-code").build(); let by

(data: &[u8])

    /// assert!(!SessionEnvelope::is_session_envelope(b"ATS")); // too short
    /// ```
    pub fn is_session_envelope(data: &[u8]) -> bool {
        data.len() >= MAGIC.len() && &data[..4] == MAGIC
    }

    /// Returns the number of files changed in this turn.
    pub fn turn_file_count(&self) -> usize {