A kind-5 request could only name events by `e` tag. Worse, one that
carried `a` tags and no `e` tags built a filter with an empty id list,
which matched every event by that author and marked them all deleted.
Handle `a` tags per NIP-09: parse `kind:pubkey:d` (the `d` value may
contain ':'), require the pubkey to be the request author and the kind
to be replaceable or addressable, and remove only versions up to the
request's `created_at` so a later re-publication survives. An empty
`d` addresses a replaceable kind.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013Tbyw6FwjhEJg3gHfPHxWt
(cherry picked from commit e695f9c66881d3d520d40f0cd3e9c95d9435938c)
