refactor: replace n8n package with overlay override

docs/packages/README.md

@@ -21,7 +21,6 @@ These packages are built from source in `pkgs/<name>/`:
 | `launch-webapp` | Launch web applications | Shell | `pkgs/launch-webapp/` |
 | `mem0` | AI memory assistant with vector storage | Python | `pkgs/mem0/` |
 | `msty-studio` | Msty Studio application | Python | `pkgs/msty-studio/` |
-| `n8n` | Workflow automation tool | Node.js | `pkgs/n8n/` |
 | `openshell` | AI shell assistant | Go | `pkgs/openshell/` |
 | `openwork` | Open-source Claude Cowork alternative powered by opencode | AppImage | `pkgs/openwork/` |
 | `pomodoro-timer` | Pomodoro timer utility | Shell | `pkgs/pomodoro-timer/` |
@@ -31,6 +30,14 @@ These packages are built from source in `pkgs/<name>/`:
 | `vibetyper` | Typing practice tool | Python | `pkgs/vibetyper/` |
 | `zellij-ps` | Project switcher for Zellij | Rust | `pkgs/zellij-ps/` |
 
+### Overlay Modifications
+
+These entries override upstream nixpkgs packages via `overlays.modifications`. They are also included in `overlays.default`.
+
+| Package | Source | Modification | Location |
+|---------|--------|--------------|----------|
+| `n8n` | `nixpkgs#n8n` | Pins a newer release and fetch hashes | `overlays/mods/default.nix` |
+
 ### Pass-Through Packages
 
 These packages are imported directly from flake inputs with minor modifications:

docs/packages/n8n.md

@@ -20,32 +20,24 @@ n8n (pronounced "n-eight-n") is a workflow automation tool that helps you connec
 
 ## Installation
 
+This repository does not publish a standalone `n8n` package. Instead, it provides an overlay that overrides the upstream nixpkgs `n8n` package with a newer pinned release when needed.
+
 ### Via Overlay
 
 ```nix
-{pkgs, ...}: {
+{inputs, pkgs, ...}: {
+  nixpkgs.overlays = [
+    inputs.m3ta-nixpkgs.overlays.default
+    # Or, if you only want package overrides:
+    # inputs.m3ta-nixpkgs.overlays.modifications
+  ];
+
   environment.systemPackages = with pkgs; [
     n8n
   ];
 }
 ```
 
-### Direct Reference
-
-```nix
-{pkgs, ...}: {
-  environment.systemPackages = with pkgs; [
-    inputs.m3ta-nixpkgs.packages.${pkgs.system}.n8n
-  ];
-}
-```
-
-### Run Directly
-
-```bash
-nix run git+https://code.m3ta.dev/m3tam3re/nixpkgs#n8n
-```
-
 ## Usage
 
 ### Basic Usage