* fix(subagents): report an explicit zero batch limit instead of defaulting it
SubagentBatchService.submit resolved max_live_items / max_running_items with
`or`, so a caller that explicitly passed 0 got the configured default
(100 / 3) persisted and the 1..N range guards never saw the value, while a
negative already failed there. Resolve the defaults on 'is None' so an
explicit 0 reaches the guard that names it.
* docs(subagents): state the >= 1 window constraint in the batch_task args
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
* feat(subagents): check and persist durable batch acceptance
Carry optional per-item criteria into native subagents, reuse the deterministic checker, and expose separate verdicts through item queries and exports. Preserve execution and retry semantics, renew leases during checks, and migrate existing batch rows with nullable acceptance fields.
* fix(subagents): align batch acceptance normalization and sandbox admission
* test(auth): include project permissions in the full-stack contract
