Azure DevOps diff runtime capture
Commit: a972b565bff4c256f539e65ba7390dbb749d2669
Environment: Linux x64; Node v26.12.1; synthetic PR 42, file.txt
Production Azure CLI adapter -> PR CLI -> diff provider -> VcsProcess -> ProcessRunner -> real subprocess
Only az is synthetic. No Azure account, HTTP requests, copied database, or tests.

Input: success
Commands executed: repos pr show -> pullRequestIterations -> pullRequestIterationChanges -> items -> items
{
  "status": "success",
  "patch": "diff --git a/file.txt b/file.txt\n--- a/file.txt\n+++ b/file.txt\n@@ -1 +1 @@\n-before\n+after\n",
  "truncated": false,
  "nextCursor": null,
  "hunks": true
}

Input: 429
Commands executed: repos pr show -> pullRequestIterations -> pullRequestIterationChanges -> items -> items
{
  "status": "failure",
  "reason": "rate-limited",
  "detail": "Azure DevOps API rate limit exceeded."
}

Input: TF400733 (nonzero az item read; usage-limit stderr)
Commands executed: repos pr show -> pullRequestIterations -> pullRequestIterationChanges -> items -> items
{
  "status": "failure",
  "reason": "rate-limited",
  "detail": "Azure DevOps API rate limit exceeded."
}