[test] req-bump 4: direct block bump (expect check green)

[DenKoren]

Validation PR for MILAB-6707 (github-ci @v4-beta require-package-path-bump gate). Points build.yaml at @v4-beta + enables the toggle. Do not merge — checking CI status only.

Expected: run / check for changesets green — the block package is bumped directly.

Greptile Summary

This validation PR switches the build pipeline to the github-ci v4 beta, enables direct package-path bump enforcement, and supplies the expected block changeset. Important touched terms:

• Changeset — release metadata identifying packages and semantic-version increments; a patch bump is added for @platforma-open/milaboratories.mixcr-clonotyping-2.
• Package path — the workspace directory whose package must be represented by a version bump; it remains block.
• Direct package bump gate — CI validation requiring a changeset for the package resolved from package-path; it is enabled through require-package-path-bump: true.
• Reusable workflow — a centrally maintained GitHub Actions workflow invoked by this repository; its revision changes from v4 to v4-beta.
• Context initialization action — the shared action that prepares CI context and versioning information; its revision also changes from v4 to v4-beta.

Confidence Score: 5/5

The changes appear internally consistent for the stated CI validation purpose, although the PR description explicitly says not to merge this test PR.

The changeset targets the package under the configured block path, and the new gate is passed to the beta reusable workflow selected to test that feature; no concrete changed-code failure is established.

Important Files Changed

Filename	Overview
.changeset/direct-bump.md	Adds a valid patch changeset whose package identifier matches the package located under block.
.github/workflows/build.yaml	Selects the beta shared CI action and workflow and enables enforcement that the configured block package receives a direct bump.

_{Reviews (1): Last reviewed commit: "test(MILAB-6707): v4-beta gate — direct ..." | Re-trigger Greptile}

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[DenKoren]

This was test of new workflow