Add Tessl Code Review to this repository

Problem Description

This repository has one existing GitHub Actions workflow, .github/workflows/ci.yml, which runs the test suite. The team wants automated pull-request review added alongside it, using the supported Tessl Code Review Action, tesslio/code-review-action.

The team has already decided how they want it to behave, so no questions need to be asked:

• Reviews should run once when a pull request becomes ready for review, and again whenever someone requests a fresh round by commenting on the pull request. Pushing new commits should not start a review on its own.
• Findings must not block merging. The review is advisory information.
• The reviewer should use the standard review profile with no custom lens selection.

Follow this repository's existing conventions for workflow file naming and for pinning third-party actions. The Tessl API token is supplied to the workflow as a repository secret named TESSL_TOKEN.

The team is adopting release v1.4.0 of the Action, whose commit SHA is 7c2f9a1e4b8d63057e9a1c4b8d63f0572a9e1c4b. Pin that full SHA, and name the release in your summary. Do not pin a tag, a branch, main, or canary, and do not leave a placeholder in the file.

Output Specification

Produce the following files:

• The Code Review caller workflow under .github/workflows/, invoking tesslio/code-review-action and nothing else. Do not copy or reimplement any review, checkout, CLI-setup, or review-publication logic into the workflow.
• summary.md at the root of the workspace, documenting the cadence and blocking contract that was installed, the repository secret the workflow needs, the permissions it grants and why, and how to update or remove the setup later.

Leave .github/workflows/ci.yml unchanged.