docs: scope ecosystem security and data claims by repository

[lukisch]

Summary

• Scope storage, network, telemetry, privilege, and data-integrity descriptions to each repository while preserving the shared ecosystem design goals.
• Link the neutral security-policy badge to the canonical policy and keep the wider index date and counts unchanged alongside the targeted Zombie-Killer-Tray readback.
• Preserve organization response commitments, contacts, supported-version rows, and partner listings.

Validation

• python -m pytest -q -p no:cacheprovider: 8 passed
• git diff --check: passed

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[lukisch]

Independently reviewed the full diff at 2c0a2cc against e4cbad5. Repository-specific wording replaces blanket behavior assurances; canonical security-policy links are preserved. English/German parity, wider snapshot dates/counts, and organization response commitments/contact data remain intact. Existing local parity checks passed (8); the hosted welcome check passed and is not a documentation-test run. No source-runtime behavior or protection settings change.