eval: five-candidate Astra boundary search and strict confirmation

[robertn702]

Summary

• Screen five pinned new Astra candidates, two attempts each at medium and xhigh (20 attempts).
• No screen meets the predeclared strict qualification threshold. Disclose an exploratory full confirmation on the strongest contrast, Sphinx #7590, with five fresh attempts each at medium/high/xhigh/Jev (20 more attempts).
• Full results: medium 0/5, high 0/5, xhigh 0/5, strict Jev 2/5. No reliable fixed-effort boundary established; no equal-quality savings claim.
• Zero fallback events or terminal classification errors in the Jev confirmation. One SymPy screening timeout retained, with no replacement.
• Document all outcomes, token/time means and per-attempt IDs. Five-candidate budget exhausted; nothing remains queued.

Validation

• All five candidates pass independent base-fails/reference-passes grading preflight.
• 39 graded/evidence-valid attempts plus one timeout.
• npm run check and npm run build pass; git diff --check passes.
• Raw prompts, patches and logs remain ignored.

Stacked above #44; leave open for review.

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📒 Files selected for processing (4)

• eval/grade-swebench.mjs
• eval/results/astra-boundary-2026-09-24.md
• eval/search-astra-boundary.py
• eval/swebench-boundary.sha256

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