Premium Analytics: add Stats comment followers endpoint

[kangzj]

Fixes #

Proposed changes

• Add Premium Analytics data package support for the Stats comment followers endpoint, following the Stats endpoint patterns established in Premium Analytics: add Stats endpoint foundation #49886.
• Wire the endpoint-specific query, hook, public exports, and sanitizer/normalizer registration where applicable.
• Keep endpoint typing tied to sanitizer keys or passthrough query inference, with focused fixtures/tests for the raw endpoint payload shape where normalization is introduced.

Related product discussion/links

• Builds on Premium Analytics: add Stats endpoint foundation #49886.

Does this pull request change what data or activity we track or use?

No. This only adds typed client data/query integration for an existing Stats API endpoint.

Testing instructions

• pnpm --dir projects/packages/premium-analytics test -- packages/data/src/queries/tests/stats-queries.test.ts packages/data/src/hooks/tests/stats-exports.test.ts --runInBand
• pnpm exec eslint --max-warnings=0
• pnpm --dir projects/packages/premium-analytics run typecheck
• git diff --check

[jp-launch-control]

Code Coverage Summary

No summary data is available for parent commit cac0235, so cannot calculate coverage changes. 😴

If that commit is a feature branch rather than a trunk commit, this is expected. Otherwise, this should be updated once coverage for cac0235 is available.

Full summary · PHP report

[github-actions]

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[kangzj]

Review-cycle audit complete. Latest invited review feedback is non-blocking, no required checks are reported, and the PR is non-draft with [Status] Needs Team Review applied.