Prompt-context signal: high-confidence
Evidence: exact path `src/lib.rs` matched in the prompt

Trust: exact | current index | parsed | full
Scope: path `src/lib.rs`; all sections
Evidence: file anchor `src/lib.rs`

── src/lib.rs (1 symbols, Rust) ──
  fn         hello  L2-2

~285 tokens vs whole-file read; ~285 tokens vs ~50-line windowed read (competent-manual baseline)