* fix(session-projection): keep released units in checkpoints
Since the Cordis rc.11 teardown order unloads the Web layer before the
base layer, Session Controller and harness-dev-context release their
projection units before their live Sessions detach. The projection
cache is still alive at that point and wrote a checkpoint holding only
the units that were still registered, replacing the complete record.
A blank Session then lost sessionListMetadata and listed as an untitled
conversation after every graceful restart.
A released unit now stays in the registry as a predecessor: it leaves
event drives, snapshots, restores, and change notifications, while
checkpoint() keeps each Session's last cell of it without advancing it.
Registering the same key again replaces the predecessor and refolds
the log. The projection cache keeps replacing whole records.
* test(session-projection): assert frozen released units across unload tests
Update the remaining unload tests that still expected a released unit
to vanish from checkpoint(): user-approval, agent-loop inbox and scope
lifecycle, time-context, and the agent registry now assert that the
same Session keeps its pre-unload row, that a later event does not
advance it, and that a Session created after the unload has no row.
The token-meter and goal unload tests also append an event after the
unload.
Document that a retained handle read still advances a released cell
that checkpoint() serves, and that restore() folds only live units, so
its refreshed rows omit released units.
* docs(session-projection): sync the ProjectionHandle type-equiv block
* docs(session-projection): record frozen released units and their upgrade
Add the upgrade guide for checkpoint() keeping a released unit's last
row, update the registration-handles Agent Note with the frozen-cell
decision and the retained predecessor, list both consequences under the
registry README's known limitations, note in the projection cache README
that a stored row can be frozen at its unit's release, and say that
restoreFloor() ignores released predecessors.
Update the agent-loop resource-lifecycle unload test, which read
checkpoints through an alias, to the frozen-row semantics.
* docs(upgrade-guide): mark the released-checkpoint snippet ignore-check
* docs(session-projection): state the retained-handle path and narrow a rejected alternative
* docs(upgrade-guide): re-record the released-checkpoint guide pairing
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