refactor: split tracking domain logic from segment client

[angeloashmore]

Resolves:

Description

Moves Prismic-specific tracking logic out of src/lib/segment.ts into a new src/tracking.ts module, keeping lib/segment.ts domain-agnostic. The Segment write key is now derived from the Prismic host rather than PRISMIC_ENV.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
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Note

Medium Risk
Changes how CLI telemetry is initialized and how the Segment write key is selected (now based on host and .prismicrc), which could impact event delivery/opt-out behavior. Runtime risk is mostly limited to analytics but touches the CLI entrypoint and exit-flush flow.

Overview
Telemetry refactor: Moves Prismic-specific tracking concerns (telemetry opt-out via .prismicrc, repository grouping, command start/end properties, and user identity) into a new src/tracking.ts, leaving src/lib/segment.ts as a domain-agnostic event queue + sender.

Initialization changes: CLI startup (src/index.ts) and sync now call initTracking/trackCommandStart/trackCommandEnd/trackUser instead of lib/segment helpers, and the Segment write key is determined from the resolved Prismic host (prod vs non-prod) and passed through the subprocess payload to sendSegmentEvents.

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