**Tool Name**: `grep`
Search file contents with native bounded search. `patterns` is an OR list (1–8); each item is independently treated as a case-sensitive regex with literal fallback. Results are ranked heuristically by default; use `mode: "raw"` for deterministic path/line order. `limit` and `offset` paginate unique primary matching lines; context is optional, does not consume the primary limit, and may be omitted at the output cap. Per-file, scan, traversal, deadline, and output budgets are reported in metadata when results are partial. Use `read` for full source and `ast_grep` for structural searches.