refactor: tool-agnostic naming in coding-rules.nix internals

lib/coding-rules.nix

@@ -26,7 +26,7 @@
 #
 # The shellHook creates:
 #   - A `.opencode-rules/` symlink pointing to the AGENTS repository rules directory
-#   - An `opencode.json` file with a $schema reference and instructions list
+#   - A `coding-rules.json` file with a $schema reference and instructions list
 #
 # The instructions list contains paths relative to the project root, all prefixed
 # with `.opencode-rules/`, making them portable across different project locations.
@@ -46,7 +46,7 @@
   #
   # Returns:
   #   An attribute set containing:
-  #     - shellHook: Bash code to create symlink and opencode.json
+  #     - shellHook: Bash code to create symlink and coding-rules.json
   #     - instructions: List of rule file paths (relative to project root)
   #
   # Example:
@@ -82,9 +82,8 @@
     ],
     frameworks ? [],
     extraInstructions ? [],
+    rulesDir ? ".opencode-rules",
   }: let
-    rulesDir = ".opencode-rules";
-
     # Build instructions list by mapping concerns, languages, frameworks to their file paths
     # All paths are relative to project root via the rulesDir symlink
     instructions =
@@ -93,8 +92,8 @@
       ++ (map (f: "${rulesDir}/frameworks/${f}.md") frameworks)
       ++ extraInstructions;
 
-    # Generate JSON configuration for Opencode
-    opencodeConfig = {
+    # Generate JSON configuration for coding rules
+    rulesConfig = {
       "$schema" = "https://opencode.ai/config.json";
       inherit instructions;
     };
@@ -102,15 +101,15 @@
     inherit instructions;
 
     # Shell hook to set up rules in the project
-    # Creates a symlink to the AGENTS rules directory and generates opencode.json
+    # Creates a symlink to the AGENTS rules directory and generates coding-rules.json
     shellHook = ''
       # Create/update symlink to AGENTS rules directory
       ln -sfn ${agents}/rules ${rulesDir}
 
-      # Generate opencode.json configuration file
-      cat > opencode.json <<'OPENCODE_EOF'
-      ${builtins.toJSON opencodeConfig}
-      OPENCODE_EOF
+      # Generate coding-rules.json configuration file
+      cat > coding-rules.json <<'RULES_EOF'
+      ${builtins.toJSON rulesConfig}
+      RULES_EOF
     '';
   };