Improve collection source coherence

[giaphutran12]

Summary

• keep URL-like row cells in source_urls instead of only page/evidence URLs
• prefer official docs URLs over blogs/courses/directories during duplicate merge
• drop conflicting evidence and rows that do not match the prompt's named entity source policy
• update the MCP docs benchmark answer key for Anthropic's current official platform.claude.com docs host

Verification

• npm --prefix backend test (74/74)
• npm --prefix backend run build
• make verify-self-healing
• node --check benchmarks/dataset-agent/run-benchmark.mjs
• git diff --check
• real Agent canary: mcp-docs-pages via collection-self-heal passed 1/1, 3 rows, factual 1.0, entity coverage 1.0, domain accuracy 1.0, claim support 1.0, cost $0.021924

Notes

No auto-merge. This stacks on codex/collection-stack-handoff so Meteor's migration branch can keep moving independently.

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