docs(terminal): keep split slicing mutations package-scoped

Co-authored-by: npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta <d8473ee32b973aa31a21a65adddcc4b69cc2a8a4dee8121ecd51926e0cddbc02@buzz.block.builderlab.xyz>
Signed-off-by: npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta <d8473ee32b973aa31a21a65adddcc4b69cc2a8a4dee8121ecd51926e0cddbc02@buzz.block.builderlab.xyz>

desktop/src-tauri/crates/buzz-terminal/tests/slicing.rs

@@ -1,6 +1,15 @@
 //! The work-denominated slicing seam: what bounds one lock hold, what bounds
 //! the queue behind it, and what proves the work was actually done.
 //!
+//! **This is half a suite.** The adversarial resize and overflow cases live
+//! in `slicing_adversarial.rs`, split out for the file-size ratchet; the two
+//! files are one set of contracts. A mutation check scoped with
+//! `--test slicing` covers 20 of 76 package tests and can report a confident
+//! pass while the killing fixture sits in the sibling file. Dropping the
+//! scrollback debt does exactly that, then dies under the package.
+//!
+//! Mutation checks run the package, never a file: `cargo test -p buzz-terminal`.
+//!
 //! Every assertion here is an **exact** expected value, never a `> 0`. A fix
 //! that bounds the lock by *dropping* work instead of deferring it reports a
 //! beautiful latency and a perfect screen-content receipt -- DECALN fills the

desktop/src-tauri/crates/buzz-terminal/tests/slicing_adversarial.rs

@@ -1,4 +1,13 @@
 //! Adversarial slicing cases for resize debt, oversized atoms, and arithmetic extremes.
+//!
+//! **This is half a suite.** The remaining work-bound cases live in
+//! `slicing.rs`; the two files are one set of contracts split only for the
+//! file-size ratchet. A mutation check scoped with `--test slicing_adversarial`
+//! covers 4 of 76 package tests and can report a confident pass while the
+//! killing fixture sits in the sibling file. Sizing from the whole budget does
+//! exactly that, then dies under the package.
+//!
+//! Mutation checks run the package, never a file: `cargo test -p buzz-terminal`.
 
 use buzz_terminal::fences::{
     max_atom_work, max_drain_work, slice_bytes_remaining, Fences, WORK_BUDGET,