[DerekMarshall]

Sets the version to 2.2.0-rc.4, made with make release-prep VERSION=2.2.0-rc.4. Only Cargo.toml and Cargo.lock change. As with the earlier rcs, it gets no CHANGELOG section, because the 2.2.0 section covers the whole cycle.

What rc.4 adds over rc.3

PR	Change
#680 / #681	fix(list): pages are counted from the top, so a / jump always shows the cursor and l off a page's last column opens the next page at its first column (#679). PageDown/PageUp keep the column and row.
#682	fix(agent-hud): the first column holds its width through every state, and row headings are bright and bold (#676).
#683	test(clipboard): the copy-command stubs run through /bin/sh, fixing a local macOS flake that failed this release's first prep.

The owner tested builds of #681 and #682 before they merged. main stays at 2.2.0-rc.4 through the soak.

After merge, on main:

1. make release-tag VERSION=2.2.0-rc.4
2. Push the tag. release.yml verifies the archives reproduce, publishes a GitHub pre-release, and dispatches the Homebrew tap and apt. The crates job publishes spyc 2.2.0-rc.4 and skips spyc-vt-sys 0.1.0, which is unchanged.

Checks: the release-prep commit hook ran make check (3,240 tests passed).

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