Add CI guard to fail PRs when genclient.sh produces drift

[Copilot]

This PR adds a pull-request check to enforce that generated client code is current. CI now regenerates the client during PR validation and fails if that step changes tracked files or introduces untracked files.

• What changed

  • Added a workflow step to run client generation in CI: uv run sh ./genclient.sh.
  • Added a repository-cleanliness gate immediately after generation to detect drift and fail the job when the working tree is not clean.
  • Added .venv/ to the repository root .gitignore so uv sync virtualenv artifacts do not cause false failures.

• Why this matters

  • Prevents stale generated client artifacts from being merged.
  • Makes generation drift explicit at PR time instead of post-merge.
  • Preserves strict detection of untracked output while excluding expected local environment artifacts.

• Workflow snippet

  - run: uv run sh ./genclient.sh
  - run: |
      if [ -n "$(git status --porcelain)" ]; then
        git status --short
        git diff
        exit 1
      fi

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 2 changed files in this pull request and generated no new comments.