fix: ignore bootstrapped eval result bundles

[aryeko]

Summary

• generate evals/results/.gitignore during generic bootstrap
• keep raw result bundles local by default while preserving README and the ignore file
• update bootstrap tests for dry-run and generated skeleton behavior

Verification

• pnpm install --frozen-lockfile
• pnpm test -- tests/bootstrap-cli.test.mjs
• pnpm format
• pnpm check
• git diff --check
• targeted result-ignore guidance sweep

Independent pre-PR review

• reviewer verdict: approve
• findings: no P0/P1 findings

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Allow curated result summaries to be added normally

When a consumer creates a curated summary under evals/results/, this * rule ignores every new file except the two explicit exceptions, so git status hides something like evals/results/summary.md and plain git add evals/results/summary.md is rejected unless the user knows to force-add or edit the ignore file. I verified this with git check-ignore -v, and Git's gitignore docs describe ! as only re-including matching exception paths; this contradicts the generated README/docs policy that humans can commit curated summaries while only raw run bundles stay local.

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