fix(ci): make import-size reports informational

[mattzcarey]

Summary

• make package import-size comparisons informational regardless of red/yellow/green classification
• remove the threshold enforcement step and its GitHub output plumbing
• emit report schema v2 without a gate field, so the artifact cannot imply a merge-blocking result
• change the job summary to say increases above 10% are marked red rather than failing CI

Build, measurement, report-generation, and artifact-upload failures still fail because no trustworthy report was produced. A measured size increase never fails the run.

This fixes the behavior visible on #2194, where one red import caused run 33635989129 to fail even though the size report itself completed successfully.

Companion Agent Think rollout: https://gitlab.cfdata.org/cloudflare/ai-agents/team-apps/-/merge_requests/8

No changeset is needed; this changes repository CI only.

Validation

• pnpm run build
• pnpm run check on Node 24: 121 TypeScript projects
• synthetic 100% import-size increase: red report, process exit 0, schema v2 without gate
• schema-v2 report parsed and rendered by the Team Apps consumer as informational

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Latest commit: 414dacd

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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commit: 414dacd