build(pkg): provision cs for native installs via a 'code-search' split package

The Docker path (bin/up) already builds and bundles cs, but the native
package path (bin/service install -> bin/build-pkg -> makepkg) did not, so
search_code would have no cs binary under a systemd/s6 install and fall back
to its 'cs not found' error.

- packaging/PKGBUILD: add 'code-search' to the split pkgname array; add go+git
  to makedepends; build the patched, statically-linked cs (pinned v3.1.0
  commit + docker/cs/luau-declarations.patch) in build(); install it to
  /usr/bin/cs via a dedicated package_code-search() (with the upstream MIT
  LICENSE). Pin kept in lockstep with the Dockerfiles.
- bin/install-pkg: install code-search alongside dispatch + dispatch-systemd
  by default (and under --all).

Verified: full  run produces code-search-0.0.1-1-x86_64.pkg.tar.zst
containing a working /usr/bin/cs (v3.1.0, static) with Luau declaration
detection; the dispatch package no longer contains cs. Tests (598) + biome
still pass.

1 files changed, 3 insertions, 3 deletions

diff --git a/bin/install-pkg b/bin/install-pkg
index 72e218b..9665847 100755
--- a/bin/install-pkg
+++ b/bin/install-pkg
@@ -5,7 +5,7 @@
 # Pass package names (without version) to install a custom set.
 #
 # Usage:
-#   bin/install-pkg                              # dispatch + dispatch-systemd
+#   bin/install-pkg                              # dispatch + dispatch-systemd + code-search
 #   bin/install-pkg dispatch dispatch-s6         # dispatch + dispatch-s6
 #   bin/install-pkg dispatch dispatch-electron   # dispatch + electron wrapper
 #   bin/install-pkg --all                        # every freshest pkg found
@@ -35,9 +35,9 @@ declare -a names
 declare -a paths
 
 if [ $# -eq 0 ]; then
-	names=(dispatch dispatch-systemd)
+	names=(dispatch dispatch-systemd code-search)
 elif [ "${1:-}" = "--all" ]; then
-	names=(dispatch dispatch-systemd dispatch-s6 dispatch-electron)
+	names=(dispatch dispatch-systemd dispatch-s6 dispatch-electron code-search)
 else
 	names=("$@")
 fi