The composer seat spent nearly all its life disabled: a session's composition is fixed once a turn has run. Move the choice to the new-session screen beside the workspace picker, where it still works, and let the session header report what a running session runs. The hero pick is staged rather than applied — that screen precedes the session it belongs to. It lands when a session becomes current and is still blank, which covers both the session a workspace connect creates and the blank one it reuses; riding `sessions.create` would miss the second. It is spent on first use, matching the workspace picker. Fix the durability the header field claimed but never had: `agentPreset` was declared on `SessionHeader` and dropped by the JSONL header line, the SQLite sessions row, the derived query index, and the cold list projection, so every resumed session came back composed from nothing. Add the web e2e lane that would have caught it — the one lane that mounts the shipped roster, which needed `cordis:group` in the scaffold's Loader builtins, as `mountRootInclude` already registers.
session-persistence/ — persistence capability family
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This family defines durable session persistence, semantic checkpoint policy, and the shipped storage backends.
| Package | Role | ctx key |
|---|---|---|
session-persistence/ |
Defines the persistence service and shared write coordination | ctx.sessionPersistence |
session-checkpoint-policy/ |
Applies semantic durability checkpoints | wraps ctx.llm and ctx.tools |
session-persistence-jsonl/ |
Persists sessions in JSONL files | registers on ctx.sessionPersistence |
session-persistence-sqlite/ |
Persists sessions in SQLite | registers on ctx.sessionPersistence |
The session-persistence decision records the family design.