fix(triage): read a large pull request's whole diff for the judge - #691

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

packages/github-tool/src/github.test.ts:371:19: Unsafe usage of optional chaining

packages/triage-workflows/evals/risk.eval.ts:76:10: Prefer String#startsWith over a regex with a caret.

apps/hub/src/github/manifest.test.ts:69:5: Do not add `then` to an object.

apps/hub/src/invitations/invite-email.ts:12:26: Unexpected control characters

packages/triage-workflows/src/triage-steps.test.ts:258:9: Prefer String#startsWith over a regex with a caret.

packages/triage-workflows/src/triage-steps.ts:46:71: Do not add `then` to an object.

packages/triage-workflows/src/triage-steps.ts:41:66: Do not add `then` to an object.

packages/triage-workflows/src/triage-steps.ts:38:72: Do not add `then` to an object.

packages/triage-workflows/src/logic/render.test.ts:429:55: Unexpected control character