feat: add Guix channel support

Add Guix channel configuration:
- Create channel description
- Add package definition
- Provide channels.scm example

.guix-channel/channel.scm

@@ -0,0 +1,9 @@
+(channel
+  (version 0)
+  (url "https://codeberg.org/glenneth/stash")
+  (name 'stash)
+  (introduction
+   (make-channel-introduction
+    "40-character-hex-string"  ; We'll generate this
+    (openpgp-fingerprint
+     "40-character-hex-string"))))

.guix-channel/stash/packages/stash.scm

@@ -0,0 +1,60 @@
+(define-module (stash packages stash)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system gnu)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages guile))
+
+(define-public stash
+  (package
+    (name "stash")
+    (version "0.1.0-alpha.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://codeberg.org/glenneth/stash.git")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0000000000000000000000000000000000000000000000000000"))))  ; We'll generate this
+    (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (delete 'bootstrap)
+         (delete 'configure)
+         (replace 'build
+           (lambda _
+             #t))
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (bin (string-append out "/bin"))
+                    (site (string-append out "/share/guile/site/3.0"))
+                    (go   (string-append out "/lib/guile/3.0/site-ccache")))
+               ;; Install binary
+               (install-file "stash.scm" bin)
+               (rename-file (string-append bin "/stash.scm")
+                          (string-append bin "/stash"))
+               (chmod (string-append bin "/stash") #o755)
+               ;; Install modules
+               (for-each
+                (lambda (f)
+                  (install-file f
+                              (string-append site "/stash")))
+                (find-files "modules/stash" "\\.scm$"))
+               #t)))
+         (delete 'check))))  ; No tests yet
+    (inputs
+     (list guile-3.0))
+    (native-inputs
+     (list guile-3.0))  ; For compilation
+    (home-page "https://codeberg.org/glenneth/stash")
+    (synopsis "Symlink management utility")
+    (description
+     "Stash is a command-line utility written in Guile Scheme that helps organize
+your files by moving them to a target location and creating symbolic links in
+their original location.  While it's great for managing dotfiles, it works with
+any directories you want to organize.")
+    (license license:gpl3+)))

channels.scm.example

@@ -0,0 +1,13 @@
+(list (channel
+        (name 'guix)
+        (url "https://git.savannah.gnu.org/git/guix.git")
+        (branch "master")
+        (introduction
+         (make-channel-introduction
+          "9edb3f66fd807b096b48283debdcddccfea34bad"
+          (openpgp-fingerprint
+           "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA"))))
+      (channel
+        (name 'stash)
+        (url "https://codeberg.org/glenneth/stash")
+        (branch "main")))