Phase 5 decision 4 (MODULE_SYSTEM.md §2.11.1): a module does not open a
connection to a game server from the website process. It talks to a sidecar,
which owns the durable copy of the game's state.
No member was added, removed or changed — the surface is identical to 1.3.0.
Minor rather than major because module-uo's `coreApi: "^1.3.0"` still resolves
and module-uo already complies, but a module written against 1.3.0 could
satisfy every member and still be built the wrong way round, which is what this
number now says.
The rule itself is MODULE_API.md §2.7 (docs, separate PR) and is the one
prohibition there with no CI behind it: an outbound socket is not statically
detectable the way an internal require is (§5.1).
742 server + 187 client tests pass; routes.manifest.json and swagger-output.json
regenerate byte-identical.
Co-Authored-By: Claude <noreply@anthropic.com>