giles 02c1f0f979 fed-sx-m2: Step 7b — public audience expansion + 3 tests ...

delivery:expand_audience(public, Sender, Graph) now returns the
sender's followers (same as the followers symbol). Per design
§13.4 the practical Public fan-out semantics for an open social
network is 'every follower of the publishing actor'. The
explicit shared-inbox peer-instance model (Mastodon-style
per-instance broadcast) defers to v3 when there's a real
known-peer-instance registry to drive it.

19/19 in delivery_set.sh:
  - public symbol now expands to sender's followers (epoch 19,
    updated from v2 placeholder)
  - public with empty follower-graph -> [] (epoch 28)
  - public + followers in same audience dedupe (epoch 29)

Conformance 761/761.

2026-06-06 23:39:00 +00:00

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