Surface collection capability diagnostics

[giaphutran12]

Summary

• Surface no-Agent browser/form/detail follow-up as a safe capability diagnostic from collection source outcomes.
• Persist disabled-Agent deferrals with a reason in the vendored source report.
• Update benchmark failure text and infra detection so normal docs text like API key setup does not become an infra blocker.

Verification

• npm --prefix backend test (66/66)
• npm --prefix backend run build
• node --test benchmarks/dataset-agent/run-benchmark.test.mjs
• node --check benchmarks/dataset-agent/run-benchmark.mjs
• make verify-self-healing
• Real no-Agent benchmark: mcp-docs-pages produced 3 rows and failed honestly with the capability diagnostic instead of infra-blocked; cost /bin/zsh.007287.

No auto-merge.

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