Add npmjs package link to CLI docs (#536)

Agent-Logs-Url: https://github.com/rajbos/github-copilot-token-usage/sessions/f7ee31a6-c2d5-45b4-836d-9e3f4034f9d6

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rajbos <6085745+rajbos@users.noreply.github.com>

Author: Copilot

cli/README.md

@@ -4,6 +4,8 @@
 
 > For user-facing documentation and command examples, see [docs/cli/README.md](../docs/cli/README.md).
 
+📦 **npm**: [@rajbos/ai-engineering-fluency](https://www.npmjs.com/package/@rajbos/ai-engineering-fluency)
+
 ## Development
 
 ```bash

docs/cli/README.md

@@ -4,6 +4,8 @@
 
 Command-line interface for analyzing GitHub Copilot token usage from local session files. Works anywhere Copilot Chat stores its session data — no VS Code required.
 
+📦 **npm**: [@rajbos/ai-engineering-fluency](https://www.npmjs.com/package/@rajbos/ai-engineering-fluency)
+
 ## Quick Start
 
 ```bash