feat: track starter project name on initialization

[levimykel]

Resolves: DT-3288

Description

Add starter property to init telemetry events

Adds the --starter flag value (e.g. agentic-migration-starter) to the command:init:start and command:init:end Segment events, so we can track which starter template users are initializing.

Changes:

• Added optional starter?: string to CommandInitStartSegmentEvent and CommandInitEndSegmentEvent types
• Passed starter: this.options.starter in all three telemetry.track() calls in SliceMachineInitProcess

The property is optional and undefined when --starter is not used, so existing behavior is unaffected.

Checklist

• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

N/A

How to QA ¹

Run this to test:

npx @slicemachine/init@alpha.lg-starter-tracking --starter agentic-migration-starter

---

Note

Low Risk
Low risk: only adds an optional field to telemetry payloads during init and updates a patch-level dependency, with no functional behavior changes when --starter is not provided.

Overview
Tracks which starter template was used during @slicemachine/init by adding an optional starter field to the command:init:start and command:init:end Segment events (including failure tracking).

Updates telemetry event typings accordingly and bumps h3 from ^1.15.5 to ^1.15.6 (lockfile resolves to 1.15.10).

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Footnotes

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[linear]

DT-3288 Migration kit usage tracker

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Project	Deployment	Actions	Updated (UTC)
slice-machine	Ready	Preview	Mar 30, 2026 4:41pm

[levimykel]

I needed to update this for the CI audit to pass.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[jomifepe]

LGTM!

[jomifepe]

❓ Was this intended to be defined in the root package.json?

[levimykel]

Yeah, this wasn't needed. I removed it and everything looks good. Good catch.