Fix Nix evaluation deprecation warnings

Replace deprecated pkgs.stdenv.isDarwin/isLinux with
pkgs.stdenv.hostPlatform.isDarwin/.isLinux, and explicitly pin
programs.neovim.withRuby/withPython3 = true so the legacy default
doesn't silently change if home.stateVersion is ever bumped. Pure
deprecation fixes, no behavior change.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BBSd4VBfoKHjE1HR3P8kmn

2 files changed, 6 insertions, 2 deletions

diff --git a/modules/home/dotfiles.nix b/modules/home/dotfiles.nix
index 21afb5e..c45c996 100644
--- a/modules/home/dotfiles.nix
+++ b/modules/home/dotfiles.nix
@@ -7,8 +7,8 @@ let
   # platform. Kept minimal and overridable via excludePackages rather than
   # a full per-platform mapping - see design.md for alternatives considered.
   platformDefaultExcludes =
-    lib.optionals (!pkgs.stdenv.isDarwin) [ "iterm2" ]
-    ++ lib.optionals (!pkgs.stdenv.isLinux) [ "herbstluftwm" "xorg" ];
+    lib.optionals (!pkgs.stdenv.hostPlatform.isDarwin) [ "iterm2" ]
+    ++ lib.optionals (!pkgs.stdenv.hostPlatform.isLinux) [ "herbstluftwm" "xorg" ];
 
   excludePackages = platformDefaultExcludes ++ cfg.excludePackages;
 in
diff --git a/modules/home/editor.nix b/modules/home/editor.nix
index 413ca8f..792d878 100644
--- a/modules/home/editor.nix
+++ b/modules/home/editor.nix
@@ -9,6 +9,10 @@
     # in separately. Without this, home-manager's own generated init.lua
     # permanently conflicts with that stow package and it gets skipped.
     sideloadInitLua = true;
+    # Pin the legacy (stateVersion < 26.05) provider defaults explicitly so
+    # this doesn't silently change if stateVersion is ever bumped.
+    withRuby = true;
+    withPython3 = true;
   };
 
   # tree-sitter (parser compilation) and a C compiler for natively-built