pub const S2C_FS_GREP: u8 = 0x47;Expand description
Grep result: [0x47][nonce:2][status:1][flags:1][detail_len:2][detail:N][records:LZ4]
where the decompressed payload is a [record_len:4][kind:1][..] stream of
FILE/MATCH records (docs/design/fs-grep.md). Status is the unified
table (FS_DONE_*); detail carries a regex compile error on INVALID.