## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Paperclip Runner owns durable provider sessions and streams their
work to the control plane.
> - Pull request #12845 added native restart recovery for live and dead
local runners.
> - A real browser test found three live-adoption gaps after that pull
request merged.
> - Lazy runner process ownership was not always stored before restart.
> - The old controller did not release its PRP authority without closing
the provider turn.
> - Reconnect events could arrive before the active provider turn was
restored.
> - This pull request closes those gaps and proves the same turn
completes after a UI hot restart.
## Linked Issues or Issue Description
Refs #12845
Related search results: #12646 covers indeterminate command results
after a runner restart. It does not cover controller adoption or
active-turn rebinding. No open duplicate pull request was found.
## What Changed
- Store lazy runnerd process ownership after provider session creation,
read, and resume.
- Detach native PRP controller authority during coordinated hot
shutdown. Keep the live provider turn running.
- Restore the exact checkpointed provider session when bounded PRP
identity events have been compacted.
- Restore the active provider turn before reconnect events are replayed.
This prevents `turn_binding_mismatch`.
- Keep exact live ownership by the current controller out of generic
orphan recovery.
- Add driver, transport, and server regression tests for these paths.
## Verification
- Ran 12 Codex driver lifecycle tests.
- Ran 53 runnerd transport tests.
- Ran 143 recovery and orphan-reaper server tests.
- Ran all 8 real-process restart recovery scenarios.
- Ran all 96 existing runner E2E unit tests.
- Ran runner TypeScript typecheck.
- Ran server TypeScript typecheck.
- Ran the migration replay test and migration safety checks.
- Tested the board UI on an isolated local instance. A real local
Codex-backed turn entered a 120-second terminal wait. The UI `Restart
now` action replaced the server and kept the same runner PID, process
start time, run ID, native session ID, runner ID, provider session ID,
and active turn. The original turn then completed.
- Confirmed one heartbeat run, no retry row, one result, one
proposed-result event, one terminal event, no protocol errors, no active
recovery state, and no surviving runner or provider process.
## Risks
- A live runner can continue provider work while no server owns the
control route. Recovery fails closed when the process fingerprint or
durable identity is ambiguous.
- Provider identity can be restored from the database only for an exact
verified adoption claim. An authenticated live `session.snapshot`
validates that identity before the driver can resume.
- The new detach path applies only to native sessions that expose
restart detachment. Other adapters keep their existing shutdown
behavior.
- This follow-up does not change the database migration or
`package.json`. The migration in #12845 remains replay-safe through `ADD
COLUMN IF NOT EXISTS` and its embedded-Postgres idempotence test. The
dedicated real-process command remains in `doc/DEVELOPING.md`.
## Model Used
- OpenAI Codex based on GPT-5. The exact serving build and
context-window size are not exposed. The run used extended reasoning,
repository tools, shell execution, and in-app browser automation.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change and contains no internal
Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
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