docs: use neutral resource language

[owainlewis]

Summary

• remove owner-specific wording from the newly added README links
• remove the first-party resource exception from CURATION.md
• keep every requested link while applying the same scope, evidence, maintenance, and scoring rules to all resources

This is a focused follow-up to #281.

Test plan

• python3 -m unittest discover -s tests -v
• python3 scripts/validate_readme.py README.md --base origin/master
• python3 scripts/validate_readme.py README.md --check-links --base origin/master
• git diff --check origin/master...HEAD

All checks pass. The validator reports 77 resources with 0 errors and 0 warnings.

Affiliation

The changed links are associated with the repository owner, but the copy and policy now treat them exactly like every other resource.

[owainlewis]

@codex review

[chatgpt-codex-connector]

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