docs: add README for fleet-pins

README.md

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+# fleet-pins
+
+Shared nixpkgs pin for the server fleet — ensures binary cache alignment
+
+## Overview
+
+Centralized nixpkgs version pin shared by all servers in the fleet. Ensures consistent package versions and binary cache hits across armer, howard, emmett, micron, bim, and mermaid.
+
+## Usage
+
+Reference in your flake inputs:
+
+```nix
+inputs.fleet.url = "git+https://git.oleks.space/oleks/fleet-pins";
+```
+
+Then use `fleet.inputs.nixpkgs` as your nixpkgs source.