Whether the configured user commented on issueUrl at or after since
(#1863). Backs the closed-PR status nudge: once the user has told the
linked issue what happened, the nudge drops out. GitHub's since filter
keys on updated_at, so an old comment edited after the close would
come back too; created_at is re-checked to count only new comments.
Fetch issues the user has commented on or is engaged in and determine conversation state. Filters out: user-authored issues, user-owned repos, excluded repos/orgs, AI policy blocklisted repos, and pull requests. Engaged issues (#1862) are scanned under the wider reply rule and fetched directly when the comment search misses them.