Port the brush shell (reubeno/brush) to Redox and adopt the recipe as a
Red Bear local recipe under local/recipes/shells/brush, with the standard
recipes/shells/brush -> ../../local/recipes/shells/brush overlay symlink so
it takes priority over any upstream WIP copy (per local/AGENTS.md "Local
recipe priority vs upstream WIP"). Removes the old recipes/wip/shells/brush.
The dependency tree did not build for Redox: nix 0.31 only partially
cfg-enables Redox and the libc crate's Redox module omits POSIX symbols that
relibc provides. Fixes are reviewable unified diffs under
local/recipes/shells/brush/patches/:
nix-0.31-redox.patch cfg-enable resource/Id/waitid/from_siginfo, rlimit
import + repr(i32), SaFlags width casts, pty.
libc-0.2-redox.patch add idtype_t, P_*/CLD_*, rusage, getrusage/waitid/
forkpty externs, siginfo child accessors.
brush-umask-redox.patch mode_t is signed on Redox; cast, not u32::from.
The recipe runs `cargo fetch` to materialise registry sources before
patching (they are only unpacked during the build), resolves the right
crate version from Cargo.lock (brush pulls both nix 0.26 and 0.31), and
applies each patch idempotently, failing loudly on version drift. The
binary target is named `brush` (not `brush-shell`), so install it
explicitly. Verified: cooks from a pristine cargo cache using only the
patch files. brush is shipped in redbear-mini as a package for in-image
validation; the login shell stays zsh until brush is runtime-proven.
vasilito
9c97cefc57