Agent Beacon CI Telemetry

Update action name (#124)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Metadata-only change to action name and description; no workflow logic
or inputs changed.
> 
> **Overview**
> Rebrands the GitHub Action’s marketplace metadata: the **display
name** is now **Agent Beacon CI Telemetry** (replacing “Beacon CI
telemetry for Claude Code”), and the **description** refers to **Agent
Beacon** JSONL and **customer-managed destinations** instead of Beacon
JSONL and SIEMs.
> 
> No inputs, outputs, or composite steps are modified—only `name` and
`description` in `action.yml`.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ffa92ec396dcf82b3f69d357acaba4082f66f9da. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->