Function session_id_from_capture 

pub fn session_id_from_capture(
    project_root: &Path,
    phase: PhaseId,
) -> Option<String>

Thin file-reading wrapper over the two session-id readers: reads the phase’s captured stdout file (via stdout_path) and delegates. None for a missing capture file, never an Err — mirrors evaluate_layer1’s lossy-read convention (CR-01: one invalid UTF-8 byte from raw sh redirection must not silently disable this reader).

claude_stream_session_id is tried FIRST, then claude_session_id. Stream-first is safe and behavior-preserving: the stream gate ([is_claude_event_stream]) declines a single-document envelope, so every capture shape that ships today still resolves through claude_session_id bit-for-bit. Without this chain the Phase 28 checkpoint-resume path — whose whole delivery is reconstructing a session via claude --resume — returns None for every stream-json capture.