Revamp repo tooling and pass CI on Node 24

[gndelia]

This PR kicks off a small revamp of the repo, with the first goal being to get CI checks passing again on a modern Node.

• Bump Node to 24 (.nvmrc), the version CI and local development now target.
• Adopt the hemilabs reusable js-checks workflow, pinned by commit SHA so every underlying action is locked by hash. This replaces the hand-rolled CI_Checks.yml and setup-env composite action.
• Switch deps:check to knip at the repo root. The previous per-package dependency-check scripts relied on a binary that was never installed, so the check never actually ran. Added a knip.json for the monorepo and exposed the fetch-plus-plus type declarations via a types field (both surfaced by the new check).
• Bump nock to v14 so the fetch-plus-plus tests pass on Node 24: isomorphic-fetch now resolves to the native global fetch (undici), which nock 13 couldn't intercept — tests were silently hitting the real network.

With these changes the full pipeline (format:check, lint, deps:check, test) passes locally on Node 22 and 24 (33 tests across all 6 packages).

Process checklist

• Manual tests passed or not applicable.
• Automated tests added or not applicable.
• Documentation updated or not required.

Metrics

Actual effort: 1h

[Copilot]

Pull request overview

This PR modernizes repository tooling so the monorepo can run checks and tests on newer Node versions, especially Node 24.

Changes:

• Updates the Node target to 24 and replaces the hand-rolled CI workflow with the reusable hemilabs JS checks workflow.
• Replaces per-package dependency-check scripts with a root-level knip dependency check configuration.
• Updates nock and exposes fetch-plus-plus TypeScript declarations via the package types field.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.nvmrc	Updates local/CI Node target to Node 24.
.github/workflows/js-checks.yml	Adds reusable JS checks workflow running on Node 22 and 24.
.github/workflows/CI_Checks.yml	Removes the previous custom CI workflow.
.github/actions/setup-env/action.yml	Removes the now-unused composite setup action.
package.json	Adds root deps:check, adds knip, and updates nock.
knip.json	Adds monorepo dependency-check configuration.
packages/fetch-plus-plus/package.json	Publishes TypeScript declarations through the types field.
packages/promise-throttle-bucket/package.json	Removes obsolete package-level deps:check.
packages/promise-swr/package.json	Removes obsolete package-level deps:check.
packages/promise-stale-if-error/package.json	Removes obsolete package-level deps:check.
packages/promise-mem/package.json	Removes obsolete package-level deps:check.

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