fix(ci): strip trailing .0 from manual-evals numeric inputs

[chromiebot]

The GitHub iOS app dispatches workflows with numeric inputs serialized as doubles ("1.0"/"50.0") even when the receiving field is declared type: number for an integer. GitHub accepts the float and threads it into the run, so the workflow triggers, but the evals CLI's parsePositiveInteger (regex /^[0-9]+$/) then rejects the value and the job fails immediately.

Strip a single trailing .0 from EVAL_TRIALS and EVAL_CONCURRENCY in the dispatch shell before forwarding them to the eval CLI. Integers and non-zero decimals are passed through unchanged, so behaviour for the web UI / API callers is identical.

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Summary by cubic

Strip a trailing .0 from EVAL_TRIALS and EVAL_CONCURRENCY in the manual-evals workflow so the evals CLI accepts integer inputs. Prevents job failures when the GitHub iOS app sends numeric inputs as doubles (e.g., "1.0", "50.0").

^{Written for commit c6c1d73. Summary will update on new commits. Review in cubic}

[changeset-bot]

⚠️ No Changeset found

Latest commit: c6c1d73

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[github-actions]

This PR is from an external contributor and must be approved by a stagehand team member with write access before CI can run.
Approving the latest commit mirrors it into an internal PR owned by the approver.
If new commits are pushed later, the internal PR stays open but is marked stale until someone approves the latest external commit and refreshes it.

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}