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0d00106fa8
A subagent child's recursion depth lived only in runtime AgentOptions, so a persisted child came back from resume counted as top-level and maxDepth stopped binding after every restart. Add SessionHeader.delegationDepth, round-trip it through the JSONL and SQLite backends (SQLite schema v5), restore it on agent-loop resume, and write it when the in-process backends create a child. The seam now owns the shared depth vocabulary (delegationDepthOf): the persisted header is authoritative and monotone — runtime options may deepen it but never lower it.
session-persistence/ — persistence capability family
The durable session-persistence seam and its storage backends. The interface package owns the abstract SessionPersistence service and the shared write coordinator; the backends are concrete implementations that register on ctx.sessionPersistence. All product packages.
| Package | Role | ctx key |
|---|---|---|
session-persistence/ |
Persistence seam + shared write coordinator | ctx.sessionPersistence |
session-persistence-jsonl/ |
JSONL-sidecar persistence backend | (registers ctx.sessionPersistence) |
session-persistence-sqlite/ |
SQLite persistence backend | (registers ctx.sessionPersistence) |
The interface lives at session-persistence/session-persistence/; backends are flat siblings. A new storage backend joins here and registers on ctx.sessionPersistence. See session persistence.