## Problem
In the dashboard **Planning Mode** screen, a planning session that runs
to completion **and creates multiple tasks** disappears from the "saved
sessions" history panel ("No saved sessions yet").
## Root cause
The multi-task route `POST /api/planning/create-tasks` called
`cleanupSession(planningSessionId)` → `unpersistSession` →
`_aiSessionStore.delete`, **deleting the persisted `ai_sessions` row**.
The single-task route `POST /api/planning/create-task` deliberately uses
`releaseSession` instead — it releases the in-memory runtime but
**keeps** the persisted completed row, which is what the history list
reads (`listAll` includes completed sessions). So multi-task creation
erased its own history entry.
## Fix
Switch the multi-task route to `releaseSession`, matching the
single-task path. The completed `type: "planning"` session row now
survives task creation and appears in history.
## Tests
Adds a regression test in `routes-planning.test.ts` asserting the
persisted planning row survives multi-task creation (verified it fails
against the old `cleanupSession` behavior). Merge gate green locally;
changeset included.
Made with Claude (see `Co-Authored-By` trailer).
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Fixed an issue where Planning Mode multi-task sessions could be
removed from planning history after task creation.
* Completed multi-task planning sessions are now reliably retained with
their completed status.
* **Tests**
* Added a regression test for the multi-task Planning Mode flow to
confirm all tasks are created and the planning session remains persisted
in history.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: Claude <noreply@anthropic.com>
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