Migrate tests to node:test and update CI

[cubap]

Replace Jest-based test setup with native node:test/assert and update CI. Tests were refactored to use node:test and node:assert (many tests/* updated), new auth token unit tests added, and routes_mounted.test.js reworked to a data-driven style. The database mock was rewritten to remove Jest-specific APIs and provide a lightweight mock/registry with resetMocks; jest.config.js was removed. GitHub Actions workflows now separate install, test (npm run test:ci) and coverage (npm run coverage:ci) steps. package.json dev tooling and test scripts were adjusted accordingly, and test bootstrap/loader/coverage artifacts were added while placeholder .txt test files were removed.

[Copilot]

Pull request overview

Migrates the test harness from Jest to the native node:test / node:assert runner. The custom database/__mocks__/index.js now ships its own minimal mock-function factory (with resetMocks()), a small loader/bootstrap pair redirects production database/index.js imports to the mock, and Jest-specific config, dependencies, and globals are removed. CI is split into separate install / test / coverage steps using c8, and several dotenv.config() calls are dropped in favor of node --env-file-if-exists=.env. New native tests are added for auth helpers and overwrite optimistic locking, and routes_mounted.test.js and content-type tests are restructured into data-driven loops.

Changes:

• Replace Jest globals/expect across all __tests__ files with node:test + node:assert/strict, and rewrite the database mock to expose Jest-compatible mock* helpers without depending on Jest.
• Update package.json scripts, drop jest/@jest/globals/dotenv dev deps, add c8, and update cd_dev.yaml / cd_prod.yaml to run test:ci and coverage:ci separately.
• Add auth/__tests__/token.test.js and routes/__tests__/overwrite.test.js, delete placeholder .txt files, and add test/bootstrap.js, test/loader.js, and test/coverage-inventory.json.

Reviewed changes

Copilot reviewed 37 out of 40 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
package.json	Switches scripts to node --test + c8, drops Jest/dotenv deps, adds c8.
jest.config.js	Removed (Jest no longer used).
test/bootstrap.js, test/loader.js	New ESM loader hook that redirects database/index.js to the mock for tests.
test/coverage-inventory.json	Hand-maintained snapshot of suites, coverage, and harness changes.
database/__mocks__/index.js	Rewritten as a Jest-free mock with resetMocks() and additional db.updateOne/findOneAndUpdate stubs.
database/index.js, app.js, bin/rerum_v1.js, auth/index.js	Drop runtime dotenv.config() calls (now handled by --env-file-if-exists).
auth/__tests__/token.test.js (+ removed .txt)	New unit tests for READONLY, isBot, isGenerator, and generateNewAccessToken.
routes/__tests__/*.test.js	Migrated CRUD/route tests to node:test, added beforeEach(resetMocks).
routes/__tests__/overwrite.test.js (+ removed .txt versions)	New optimistic-locking tests for /overwrite and version header on /id.
routes/__tests__/bulkUpdate.test.js	Replaces skipped TODO with a real mocked test.
routes/__tests__/contentType.test.js, __tests__/routes_mounted.test.js	Refactored into data-driven loops.
__tests__/core_provider_contract.test.js, __tests__/openapi_sync_artifacts.test.js, __tests__/provider_sync_artifacts.test.js	Migrated assertions to assert.match / assert.deepEqual.
.github/workflows/cd_dev.yaml, .github/workflows/cd_prod.yaml	Split into install / test:ci / coverage:ci steps.
Removed .txt placeholder tests	Cleanup of deprecated stubs.