Constant MAX_INGEST_FILE_BYTES 

pub const MAX_INGEST_FILE_BYTES: usize = 1_048_576;

Maximum accepted size of a single file read through a path-referenced context fragment (V2b-1 path ingestion) — 1 MiB, the same ceiling as MAX_FRAGMENT_BYTES: an ingested file becomes an ordinary fragment’s content, so it must not exceed what a fragment is allowed to carry. Checked from fs::metadata BEFORE the file is read, and re-checked after (fs::read can race a concurrent write) — never clamped, always refused, so a truncated read can never silently masquerade as the whole file.