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DottaandPaperclip
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## Thinking Path > - Paperclip coordinates agent work and preserves its execution state. > - Native Runner checkpoints preserve authority across controller changes. > - Warm sessions also need checkpoint writes while their successor prepares. > - External persistence replaces the local state file with a marker. > - Two existing checks treated those valid states as lost ownership or prior activity. > - This PR uses the existing preparation lease and canonical controller state to keep those checks accurate. > - The result is safe warm-session retirement and fresh-session startup on reused sandboxes. ## Linked Issues or Issue Description Related: #17439 and #17320. The open #17401 changes the recovery welcome window and does not cover these paths. **What happened?** A configuration change could fail before the next provider turn with `runner did not durably suspend before checkpoint`. The task already pointed to its preparing successor, but that successor did not yet have a native coordinator. The old completed runner's maintenance checkpoint was rejected. A separate fresh session on a reused sandbox could fail with `resumed_unavailable`. Checkpoint registration had replaced the full local state file with an external-persistence marker. The bootstrap check still required the old full-file format. Process supervision then reported unconfirmed termination before launch. **Expected behavior** Retire the completed warm runner under the same process's live preparation lease. Admit a fresh remote session only when the registered controller proves exact identity, no prior activity and pending bootstrap commands, and the remote session directory can be claimed atomically. **Steps to reproduce** 1. Complete a native warm turn with external checkpoint persistence. 2. Change configuration so instruction preparation must retire that session, then submit a follow-up. 3. Separately, admit a fresh native session on a reused sandbox lease after external checkpoint registration. **Paperclip version or commit** Reproduced in the checkpoint implementation introduced by #17439. Fixed against current master. **Deployment mode** Source checkout tests and a hosted Docker/Daytona incident. No deployment or original-task retry is part of this PR. ## What Changed - Accept completed-run maintenance under the exact successor's live, same-process preparation lease only before a native coordinator exists. - Preserve original controller generation, accepted-result, no-new-work, company and task checks. - Pass the registered controller through the existing connection callback and read its current canonical state for untouched-session proof. - Keep marker-only, identity, activity, backup and atomic remote-directory guards. - Add regressions and update execution semantics and session verification recipes. ## Verification - Warm retirement red: the real Postgres writer rejected the preparing successor's `runner.suspend` checkpoint with `native_runner_checkpoint_owner_lost`. - Warm retirement green: 14 Postgres ownership cases pass, including stale/foreign/expired owners, conflicting native authority and new provider work. - Bootstrap red: real controller registration and external persistence caused the resumed and replacement positives to fail. Six external negative cases passed. - Bootstrap green: all 34 bootstrap cases, the bootstrap-state predicate and 13 connection-driver cases pass (48 total). - `node scripts/check-maps.mjs` and `git diff --check` pass. - Full `pnpm -r typecheck` and `pnpm build` pass. - Full local `pnpm test:run` remains partial/interrupted. The default attempt could not initialize embedded Postgres on this Mac. A dedicated Postgres 18 attempt ran for 17 minutes without a completed file result before interruption; the generic helper separately confirmed unsupported embedded Postgres (`initdb` failed after five attempts) and ignores the external database URL. The generic probe skipped one test. Setup and interrupted-run logs are retained; neither is claimed as a behavioral red or a full local pass. - Real source-hosted Codex/Daytona acceptance was attempted at `6ce7fcacc4` with `gpt-6.1-sol`, `xhigh`. The actual task stopped before provider work at `runner_ingress_auth_failed`, with zero authenticated connections and zero source events. A separate environment-qualification handshake reached challenge/response; that does not prove task authentication. The three-turn warm reuse, configuration retirement, useful output and reload workflow remains unverified, so this PR stays draft. - The live attempt used the cached Linux amd64 Runner binary `7437a4e32a099180889be534fcfb2a086046514490c1448aba46c55848983ed8` from the immutable Daytona image. The current staging binary could not be copied because SSH timed out, and the configured current EXE image returned registry 403. No compatible current local or CI-downloadable artifact was available. Earlier setup failures and cleanup receipts are retained; no provider success is claimed. Disposable test resources were cleaned up. - Exact-head Greptile completed at 5/5 with no open feedback: https://github.com/paperclipai/paperclip/pull/18011#issuecomment-6469515952. All current-head CI checks pass: 53 successful checks and two intended Storybook skips. ## Risks The preparation fallback affects maintenance checkpoints only after an accepted result. An existing native coordinator prevents that fallback. Stale controller generations, expired or foreign preparation leases, wrong tasks and new provider work remain denied. The bootstrap check retains the live controller object and reads current state each time. It does not trust a marker or restore local state beneath a live controller. Pending turns, prior events/connections, backups and existing remote directories retain recovery gates. No schema, provider binary, credential, permission or lifecycle-policy change is required. ## Model Used OpenAI GPT-6 through Codex, with reasoning, tool use, code execution and collaborating agents. This session does not expose a more specific model ID or context-window size. ## 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 (e.g. `docs/...`, `fix/...`) 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 Co-authored-by: Paperclip <noreply@paperclip.ing>