ci: add CI log analysis workflow and Flue agent

[NuroDev]

Adds a Flue-powered CI failure analysis workflow for workers-sdk PRs.

This PR introduces a .flue source area with a ci-log-analyst agent and a ci-log-analysis workflow. When the main CI workflow fails or times out on a PR, the new GitHub Actions workflow downloads the failed run logs, runs the Flue workflow with the Node target, and posts or updates a sticky PR comment with the diagnosis. The comment includes a human-readable summary plus the structured JSON result so maintainers can see whether the failure looks actionable, formatting-related, or likely to be a flake.

The workflow uses the existing Cloudflare AI Gateway secrets (CF_AI_GATEWAY_ACCOUNT_ID, CF_AI_GATEWAY_NAME, and CF_AI_GATEWAY_TOKEN) and posts comments with GH_ACCESS_TOKEN, so the PR comment is attributed to workers-devprod instead of github-actions[bot]. It also keeps GitHub writes outside the agent itself: Flue analyzes local log files, while the workflow handles comment upserts through gh.

This also updates the workflow README and adds the Flue runtime/CLI and Valibot package metadata needed to run and typecheck the Flue source.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows: validated with pnpm exec tsc -p .flue/tsconfig.json --noEmit, pnpm exec flue build --target node, pnpm check:workflows, pnpm check:catalog, and targeted oxfmt --check runs.
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this is internal repository automation; the workflow behavior is documented in .github/workflows/README.md.

A picture of a cute animal (not mandatory, but encouraged)

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Latest commit: f2c71dc

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commit: f2c71dc

[NuroDev]

Closing as this was a good first experiment. Work has been shifted to work on RM-28983