Document remaining collection benchmark evidence

[giaphutran12]

Summary

• documents scored Agent-enabled chunk evidence for the remaining benchmark prompts
• separates chunked coverage evidence from single-run full-pack proof
• updates the next engineering move toward fixing source/domain evidence and Agent cancellation behavior before another full-pack attempt

Benchmark Evidence

• benchmark-results/collection-evidence-support-4prompt-20260523-002: first 4 focused prompts passed 4/4, 0 blocked, cost about $0.193776
• benchmark-results/collection-evidence-support-mid4-20260523-002: middle 4 average prompts passed 0/4, 0 blocked, cost about $0.208366
• benchmark-results/collection-evidence-support-remaining8-20260523-001: back 8 prompts passed 4/8, 0 blocked, cost about $0.265922
• Combined scored chunk evidence: 8/16 passed, 8 failed, 0 blocked, about $0.668064, 187 rows, 564 evidence quotes, 184 source URLs, 36 Agent runs

This is coverage evidence across multiple runs on the same code path. It is not a single-run full-pack repeatability/wall-clock proof.

Verification

• git diff --check
• make verify-self-healing

Notes

• Docs-only stacked PR on top of Document collection evidence handoff #50.
• No raw benchmark-results/ artifacts are committed.
• Do not merge automatically.

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[giaphutran12]

Closing stale draft cleanup PR; superseded by later BigSet work.