github workflow: add evm chain

[wilson-cl]

This pull request introduces automation for adding new EVM chains to the client.proto file, both by providing a new GitHub Actions workflow and by adding a supporting CLI tool. The workflow allows chains to be added via manual, API, or workflow triggers, while the CLI tool handles the logic of updating the proto file with the new chain information.

Automation for adding EVM chains:

• Added a new GitHub Actions workflow (.github/workflows/add-evm-chain.yml) that automates the process of adding an EVM chain to client.proto, regenerates embedded files, and creates a pull request. The workflow can be triggered manually, programmatically, or via API, and outputs a summary with chain and PR details.

Supporting CLI tool for proto updates:

• Introduced a new Go CLI tool (cre/go/tools/add-evm-chain/main.go) that takes a chain selector, looks up the corresponding chain name using the chain-selectors library, checks for duplicates, inserts the new entry in sorted order into the defaults array in client.proto, and writes the updated file.

Example Flow

1. Trigger workflow

2. Workflow Result

3. PR Created

4. If the chain exists

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Latest commit: 63ea51f

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[github-actions]

👋 wilson-cl, thanks for creating this pull request!

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[github-actions]

The latest Buf updates on your PR. Results from workflow Regenerate Protobuf Files / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Jan 22, 2026, 1:39 AM

[gustavogama-cll]

We want to "scope" these workflows to the CRE team.

Could you please:

1. change the filenames to cre-add-evm-chain.yml and cre-notify-sdk-go.yml
2. update CODEOWNERS so that the cre team owns .github/workflows/cre-*.yml

[wilson-cl]

1. renamed with cre-prefix
2. updated codeowners with .github/workflows/cre-*.yml