Improve collection evidence support

[giaphutran12]

Summary

• add evidence for URL-valued cells when the extractor returns a URL field without a separate evidence quote
• merge duplicate entity rows that differ only by corporate suffixes like Corp. or Corporation
• prefer later, stronger canonical source pages when duplicate rows disagree
• update stale focused benchmark answer keys for Paddle's current pricing page and NVIDIA's May 20, 2026 Q1 FY2027 earnings release

Verification

• npm --prefix backend test (76/76)
• npm --prefix backend run build
• make verify-self-healing
• node --check benchmarks/dataset-agent/run-benchmark.mjs
• git diff --check

Real Agent/self-healing evidence:

• benchmark-results/collection-evidence-support-mcp-20260523-001: mcp-docs-pages passed 1/1, factual 1.0, entity 1.0, domain 1.0, evidence 1.0, claim 1.0, cost $0.022256
• benchmark-results/collection-evidence-support-earnings-20260523-003: earnings-release-pages passed 1/1 with 3 rows, NVIDIA Q1 FY2027 source only, cost $0.067237
• benchmark-results/collection-evidence-support-4prompt-20260523-002: focused 4-prompt collection-self-heal run passed 4/4, factual 1.0, entity 1.0, domain 1.0, evidence 1.0, claim 1.0, cost $0.193776

Notes

No auto-merge. This stacks on PR #48 and keeps the collection runtime behind explicit Agent opt-in.

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