fix: connection targets must be https:// URLs only
carry:// and vault:// URI schemes are not valid connection targets.
The graph only deals with https:// URLs.
- Filesystem touchpoints: extract the https:// URL from each carry/vault
note and use it as the target. Notes without URLs are skipped.
- D1 carry touchpoints: use the carry record url field (not atUri) as
the target for entities and reasonings. Citations already used url.
- Deleted 41 garbage connection records from PDS (carry://, vault://,
and at:// targets).
- Removed temporary cleanupConnections endpoint.
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