Prune commentary and stale Rust port notes

rig-input/Cargo.toml

@@ -3,30 +3,14 @@ name = "rig-input"
 version.workspace = true
 edition.workspace = true
 
-# Layer 2's input half (docs/RUST.md's "Three test layers"): replays one
-# of the `.touch` files the headless tests use into whatever window is
-# under a Wayland compositor, so the *same recording* drives the
-# assertion layer and the layer a person looks at.
-#
-# It exists because this machine's compositor has no pointer to move.
-# `run-headless.sh` starts sway on the headless backend with no input
-# devices at all (`WLR_LIBINPUT_NO_DEVICES=1`, `LIBSEAT_BACKEND=noop`),
-# so `swaymsg seat - cursor press` reports success and nothing reaches
-# the client -- `swaymsg -t get_seats` shows `capabilities: 0`. wlroots
-# 0.19 dropped `WLR_HEADLESS_INPUTS`, and ydotool's uinput device would
-# be ignored by a compositor that is not reading libinput. The
-# virtual-pointer protocol is what is left, and it is a client protocol,
-# so it needs no devices and no root.
-
-# Named for what it does rather than for the crate, since the crate may
-# grow a keyboard replay beside it.
+# Replays harness `.touch` files through Wayland's virtual-pointer protocol;
+# headless sway has no input devices for coordinate-driving tools to move.
 [[bin]]
 name = "replay-touch"
 path = "src/main.rs"
 
 [dependencies]
-# `TouchScript` -- the same parser the harness uses, so a file that
-# replays here and one that replays headless can never disagree.
+# Share the harness parser so both layers interpret recordings identically.
 iris = { path = ".." }
 wayland-client = "0.31.15"
 wayland-protocols-wlr = { version = "0.3.12", features = ["client"] }