auto-triage improvements: fix tests, subagents, triage directory

[FredKSchott]

Changes

• Fix: Revert AGENTS.md back to older format, and fixed the syntax issue instead. This was 1/2 of the slow down in the latest version, was that agents didn't understand these instructions or how to use these scripts in a more granular way, so ended up running the full top pnpm test too often.
• Chore: Bumped @flue/cli from 0.0.30 to 0.0.31. This was the other half of the slow down, which is disabling subagents. We're already splitting up the job into sub-agents ourselves with the 5 step process. In practice, the agent never seems to give the right context to the sub-agent, so it ends up re-doing a ton of work (ex: redoes all past steps manually instead of just reading the report.md file, because the parent didn't tell it that it existed).
• Fix: Triage reproduction skill now copies from local examples/ templates instead of scaffolding with create-astro, avoiding issues with create-astro versions not matching the monorepo and causing weird symlink problems + installing the repo into the wrong, not-git-ignored location.

Testing

• No testing for CI

Docs

• No docs for CI

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[FredKSchott]

Fast-followup from #15513, self-approving and merging to solve a speed regression in CI