giles bcfbd9a528 fed-sx-m2: Step 2b — actor_state projection fold + 19 tests ...

next/kernel/actor_state.erl mirrors define_registry's structure: a
2-arity fold_fn that plugs into projection:start_link/3, an
Erlang-fun stand-in for the genesis actor-state.sx projection body.

State shape:
  [{ActorId, Profile}, ...]

Profile is a property list with :type, :name, :preferredUsername,
:summary, :icon, :public_keys, :moved_to, :created. Maps #{} aren't
registered in this substrate, so this matches the kernel bucket /
registry shape convention.

Folding rules per design §9.1-§9.4:
  - Create{Person|Service|Group}: register profile, capturing object
    fields + :published seq as :created. Duplicate Create no-overwrite.
  - Update{Person|Service|Group, patch}: deep-merge :patch into
    profile last-write-wins per key.
  - Move: record :moved_to.
Other activity types and non-actor object Creates pass through.

Local find_keyed/has_keyed/set_keyed helpers (same gap as Step 1a:
no lists:keyfind/keymember in this substrate).

19/19 in next/tests/actor_state_pure.sh covering:
  - new/0/has/2/lookup/2/actors/1 base cases
  - Create for Person/Service/Group all three actor types
  - Profile field capture (name, preferredUsername, public_keys, created)
  - Duplicate Create no-overwrite
  - Two independent actors
  - Update field merge + per-key last-write-wins
  - Update for unknown actor pass-through
  - Move :moved_to
  - Non-actor Creates pass through
  - Activities without :actor pass through
  - fold_fn/0 returns is_function(F, 2)

Conformance 761/761. Step-2-adjacent no-regression gate 106/106
across 6 suites (define_registry_pure, projection_pure,
projection_server, nx_kernel_multi, bootstrap_start, smoke_app_pure).

2026-06-06 11:53:14 +00:00

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