[DX-2826] use v2 contracts by default in the local CRE

[Tofel]

No description provided.

[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

• #added For any new functionality added.
• #breaking_change For any functionality that requires manual action for the node to boot.
• #bugfix For bug fixes.
• #changed For any change to the existing functionality.
• #db_update For any feature that introduces updates to database schema.
• #deprecation_notice For any upcoming deprecation functionality.
• #internal For changesets that need to be excluded from the final changelog.
• #nops For any feature that is NOP facing and needs to be in the official Release Notes for the release.
• #removed For any functionality/config that is removed.
• #updated For any functionality that is updated.
• #wip For any change that is not ready yet and external communication about it should be held off till it is feature complete.

[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[Copilot]

Pull request overview

Updates the local CRE tooling and system tests to use v2 registry contracts by default, while keeping an explicit opt-in path for legacy v1 coverage.

Changes:

• Switched CRE CLI defaults (--with-contracts-version) from v1 to v2 and updated shell completions/help text accordingly.
• Updated system test setup (and canary docs) to rely on the new v2 default, while forcing v1 explicitly where needed.
• Adjusted CI workflows to start CRE with v1 only when required; otherwise rely on the v2 default.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
system-tests/tests/smoke/cre/v2_sharding_test.go	Updates local run instructions to rely on default v2 contracts.
system-tests/tests/smoke/cre/v2_grpc_source_test.go	Updates local run instructions to rely on default v2 contracts.
system-tests/tests/smoke/cre/cre_suite_test.go	Forces v1 tests to use v1 explicitly; removes explicit v2 flags from v2 tests.
system-tests/tests/canaries_sentinels/README.md	Docs now reflect v2 as default and explain opting into v1.
system-tests/lib/cre/types.go	Updates default registry contract versions to v2 semvers.
core/scripts/cre/environment/environment/workflow.go	Changes default --with-contracts-version to v2 for workflow commands.
core/scripts/cre/environment/environment/environment.go	Changes default --with-contracts-version to v2 for env start.
core/scripts/cre/environment/completions.go	Updates completion descriptions to reflect v2 default.
core/scripts/cre/environment/README.md	Adds docs for opting into legacy v1 contracts and documents the flag.
.github/workflows/cre-system-tests.yaml	CI now passes v1 explicitly when needed; relies on default v2 otherwise.
.github/workflows/cre-regression-system-tests.yaml	Same as above for regression workflow.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.