connectors 0.5.8

Changed

• Migrate the seventy-three docs/stories/S-*.md records into the AEP planning store, so the
  repository has one backlog instead of two that never named each other. Every source file keeps
  its text and gains a backlink to the artifact that now carries it; nothing was deleted.
• The thirty-five stories the sources call done are recorded as resting on an assertion rather
  than an observed run, and aep artifact validate reports that count on every run.

No crate source changed in this release. The version moves because it is the artifact identity
written into every catalog document, connectors.lock and the wire User-Agent, and those move
together or not at all.

Full Changelog: v0.5.7...v0.5.8