## Thinking Path
> - Daytona preserves a stopped sandbox filesystem, but deleting or
replacing a sandbox removes its only remote copy.
> - Warm reuse therefore improves latency but cannot be Paperclip's
durability boundary.
> - The host execution workspace must remain authoritative after every
successful turn, while same-run recovery must avoid overwriting
unexported remote work.
> - Result proposal, workspace export/merge, and terminal completion
need a durable, replayable ordering so a crash never starts a duplicate
provider turn.
> - A paid browser acceptance suite must exercise both legacy Codex and
Runner Codex for three real turns on one continuously warm Daytona
sandbox.
## Linked Issues or Issue Description
Refs #12901.
Runner Codex did not previously export successful Daytona workspace
changes back to the authoritative host workspace. That made warm reuse
depend on Daytona's remote filesystem and left deleted/replacement
sandboxes without a reliable reconstruction path. The existing paid
fixture also lacked a focused three-turn continuity case for both Codex
adapters.
## What Changed
- Persist versioned, atomic native workspace-sync descriptors and
durable seeds in `PAPERCLIP_HOME`, without credentials or a database
migration.
- Classify fresh, warm, replacement, and same-run-recovery workspace
preparation explicitly; ambiguous lease/root/digest evidence fails
closed.
- Finalize native workspace export/merge after semantic result proposal
and before run completion, with idempotent replay that never submits a
second provider turn.
- Surface legacy Codex workspace restoration failures instead of masking
them, while preserving an earlier provider error when both fail.
- Keep healthy reusable Daytona leases warm for legacy and native
adapters, stamp finalized workspace generations, and retain existing
cleanup behavior for per-turn or unhealthy leases.
- Preserve Runner Codex's provider process/session across warm turns,
including bounded post-terminal tail draining and exact authority
rotation.
- Add the exact paid `daytona-warm-continuity` matrix:
- `legacy-codex × daytona × warm-three-turn`
- `runner-codex × daytona × warm-three-turn`
- Drive all three turns through the browser, verify ordered file
continuity and stable lease/workspace/runtime identities, capture
per-turn timings, and delete the sandbox immediately after assertions.
- Document `pnpm test:e2e:runner -- --suite daytona-warm-continuity`; no
package script was added.
## Verification
- `pnpm typecheck` — passed, including migration safety (no migration
added)
- Focused server/runner Vitest coverage — 144 passed
- `pnpm test:e2e:runner:unit` — 114 passed
- `pnpm test:e2e:runner:typecheck` — passed
- `pnpm --filter @paperclipai/paperclip-runner test:codex` — 66 passed,
1 helper ignored
- `native-session-executor.test.ts` — 139 passed, including safe
fail-closed cleanup after remote runner identity capture failure
- Paid local browser acceptance, exact post-rebase Linux/amd64 runner
binary:
- Runner Codex — passed in 1.7m; 3 runs; lease outcomes `created,
resumed, resumed`; 10/10 matchers; cleanup passed
- Legacy Codex — passed in 2.7m; 3 runs; lease outcomes `created,
resumed, resumed`; 10/10 matchers; cleanup passed
- [Protected paid GitHub Actions
campaign](https://github.com/paperclipai/paperclip/actions/runs/34026735033)
against `7da42a91b95fa7fb2df126668ef7e37afb3b2b9d` — passed 2/2:
- Runner Codex — 3 runs; lease outcomes `created, resumed, resumed`;
evidence and cleanup passed
- Legacy Codex — 3 runs; lease outcomes `created, resumed, resumed`;
evidence and cleanup passed
- Merge/enforcement, S3 history, and Pages publication jobs passed
- Paid result artifacts were scanned for both provider credentials;
neither secret was present.
- Current PR checks — 31 passed, 1 expected Storybook skip; Greptile
5/5; Superagent security scan passed
- `git diff --check origin/master...HEAD` — passed
- Confirmed no `package.json`, lockfile, migration, or SQL changes.
## Risks
- Workspace synchronization now sits on the terminal-success path, so a
remote export failure deliberately prevents false success. Retryable
state retains its lease/seed; loss of the only unexported remote copy
fails closed.
- Warm provider reuse has strict identity and quiescence checks.
Mismatched or ambiguous evidence blocks reuse rather than risking
concurrent provider work.
- The paid suite incurs Daytona and Codex cost only in the existing
protected scheduled/manual workflow and explicitly destroys its sandbox
after each cell.
## Model Used
OpenAI Codex with GPT-5 agentic reasoning, repository inspection, real
browser E2E execution, Rust/TypeScript test execution, and GitHub
Actions diagnostics.
## 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 linked an existing issue or described the issue
in-PR
- [x] I have not referenced internal/instance-local Paperclip issues or
links
- [x] My branch name contains no internal ticket id
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have documented the dedicated suite invocation without adding a
package script
- [x] I have considered and documented risks above
- [x] All Paperclip CI gates are green on the current revision
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
on the current revision
- [x] I will address all reviewer comments before requesting merge
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