giles 089d1445a1 fed-sx-m2: Step 1b — nx_kernel multi-actor gen_server calls + 9 tests ...

New gen_server exports add_actor/3, publish_to/2, log_tip_for/1,
actors/0, state_for/1, bucket_for/1, with_projections_for/2 —
each is a thin gen_server:call delegating to 1a's pure-functional
bucket API via fresh handle_call branches. Existing single-actor
calls (publish/1, log_tip/0, with_projections/1) route through
bucket 0 unchanged.

Per-actor mailbox sharding (one gen_server per bucket so distinct-
actor publishes don't serialise on a single mailbox) is forward-
looking — deferred to Step 4 where the per-actor HTTP routing makes
it actually load-bearing. Single-mailbox serialisation is fine for
Steps 1-3.

nx_kernel_multi.sh extended from 17 to 26 cases (gen_server load,
start_link bucket-0 seed, add_actor/3 dup detection, publish_to/2
per-actor isolation, interleaved publishes, no_actor error, state_for
+ with_projections_for round-trips). 134/134 across 12 nx_kernel-
adjacent + http suites. Erlang conformance 761/761 preserved.

2026-06-06 10:25:43 +00:00

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