feat(seed): add H4, a 100-participant hackathon in team formation - #208
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Adds "Data for Good Hackathon 2026": registration closed, 104 confirmed participants, 15 projects, ~264 unranked preference rows and no teams — the input a team-assignment algorithm takes, which none of H1-H3 provide. The 100 synthetic participants exist in Postgres only and hold Member and nothing else; the four dev users take part so there is always someone to sign in as. Preference weights are deliberately skewed and drawn from a fixed PRNG seed, so the fixture is reproducible and contains both the project that needs splitting (43 picks) and the one that cannot reach quorum (2). Also moves H1's Team Beta from alice to bob: nobody now belongs to two teams within a hackathon, and a plain Member with no matching team domain is a cleaner subject for the cross-team submission read case.
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Adds "Data for Good Hackathon 2026": registration closed, 104 confirmed participants, 15 projects, ~264 unranked preference rows and no teams — the input a team-assignment algorithm takes, which none of H1-H3 provide. The 100 synthetic participants exist in Postgres only and hold Member and nothing else; the four dev users take part so there is always someone to sign in as.
Preference weights are deliberately skewed and drawn from a fixed PRNG seed, so the fixture is reproducible and contains both the project that needs splitting (43 picks) and the one that cannot reach quorum (2).
Also moves H1's Team Beta from alice to bob: nobody now belongs to two teams within a hackathon, and a plain Member with no matching team domain is a cleaner subject for the cross-team submission read case.