tests: add functional tests

[cryptodev-2s]

Note

Add comprehensive functional tests for check-deps and a runCheckDeps helper to execute it within the monorepo environment.

• Tests (functional):
  • Add check-deps suite in src/functional.test.ts covering:
    • Detecting dependency bumps and validating changelogs (deps, peerDeps, non-scoped packages).
    • --fix auto-inserting/updating Unreleased changelog entries (including BREAKING peerDeps, multiple bumps, re-bumps merging PRs, renamed packages).
    • Ordering BREAKING changes before regular deps and handling no-change scenarios.
• Test Helper:
  • Add runCheckDeps to tests/functional/helpers/monorepo-environment.ts with options --from, --to, --fix, --pr to invoke the tool.

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[cursor]

Bug: Test setup uses wrong initial dependency version

The test "updates existing changelog entry when dependency is bumped again" has inconsistent setup. The initial package.json sets @scope/b to 1.0.0, but the changelog already documents a bump "from 1.0.0 to 2.0.0". The comment at line 1853 confirms the intent is to test bumping "from 2.0.0 to 3.0.0". The initial dependency version should be '2.0.0' to match the changelog state and test the intended "bump again" scenario. As written, the git diff will show a change from 1.0.0 to 3.0.0, not 2.0.0 to 3.0.0.