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There were two identity systems: SessionManager keyed on the stable, UNIQUE anon_token, and getOrCreateUser keyed on the mutable, non-unique socket_id. The latter could create a duplicate "orphan" user row (or resolve the wrong row) when the socket_id lookup raced the session's socket_id update — desyncing credits and payouts between the two rows for one human. - getOrCreateUser now resolves through SessionManager's stable identity first (anon_token -> users.id), re-selecting a fresh row by stable id, and only falls back to the legacy socket_id lookup when no session exists. The last-resort create now warns, since it indicates a missing session. - gameModeManager.sessionManager is wired in SocketHandlers so the session-first path is active in production. - anon_token is already UNIQUE (migration 003), so the stable-identity constraint already exists; no new migration needed. Re-keying the in-memory activeGames map by user_id is deferred (invasive; already mitigated by stamping dbUserId on the game in the disconnect fix). Adds identityResolution.test.js proving no duplicate row is created when a session exists. Full suite: 17 suites / 136 tests.