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DottaandPaperclip
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## Thinking Path > - Paperclip runs agent tasks and preserves their managed agent files. > - Heartbeat must prepare a private copy, collect stopped-provider edits, and retain ownership during warm-session handoff. > - That lifecycle is spread across preparation, adapter callbacks, and cleanup. > - A per-run controller can own the copy and receipt while the executor retains teardown ordering. > - This PR moves that coordination into a dedicated module. > - Live getters preserve updated state and partially acquired resources. ## Linked Issues or Issue Description **What existing behavior does this improve?** Maintenance of heartbeat instruction preparation. This is the second and final PR in this batch, originally stacked on #15980. That dependency is now merged; this PR is rebased onto its squash merge with an identical patch and identical touched-file contents. Related-PR search found no duplicate extraction. **Current behavior** After #15980, `heartbeat.ts` has 4,215 lines and 173,657 bytes. It coordinates instruction-copy preparation, save receipts, warm handoffs, and deferred cleanup inline. **Proposed behavior** `heartbeat/instruction-working-copy.ts` owns the per-run lifecycle in 233 lines. `heartbeat.ts` becomes 4,055 lines and 162,520 bytes. The executor retains the outer release order, unavailable-copy reporting, and environment/service cleanup policy. **Reason and benefit** The copy, save receipt, and warm ownership are readable together. The remaining executor names preparation and dispatch phases without obscuring teardown decisions. **Breaking changes** None intended. All 140 named public heartbeat exports remain unchanged. ## What Changed - Extract copy preparation, save/checkpoint callbacks, warm reservation/adoption, prompt guidance, and the deferred-release closure. - Read the executor's current run row through a callback; expose current copies, receipts, and acquired cleanup handles through live getters. - Keep cleanup handles available after preparation failure, and preserve release-before-retry on invalidated warm reuse. - Add four public-path characterization tests with real disposable PostgreSQL and files, plus four direct boundary tests. - Add isolated browser acceptance with a real process that edits instructions, completes its task, and reads the saved bytes on its next task. - Document the boundary and opt-in acceptance command. ## Verification - **Before extraction:** four new public-path tests pass on the original implementation, as do 108 existing instruction-copy/directory/native-cleanup tests. The two-task browser journey also passes on the baseline server. - **After extraction:** all 112 baseline tests pass; all four new boundary tests pass; 12 selected native-session ownership/retirement cases pass (the other 670 cases were outside this focused selection). - **Browser acceptance:** the fresh extracted-code server passes the full two-task journey (25.9 seconds): real child-process edits, saved/unchanged receipts, canonical bytes through the agent-file API, next-task restore, completed task UI, and copy cleanup. - `pnpm -r typecheck`, final server typecheck, and `pnpm build` pass. Module-boundary and public-export checks pass. - Normalized syntax comparison confirms all moved bodies and the reconstructed executor match the base, accounting explicitly for live run getters and delegation. - Final rebased head: `a08872c97e587a21ffc0fc6b78f34b81e484e7b0`. Combined entry-point and boundary regressions pass again (12/12); fresh Greptile review is 5/5 with no findings. All 55 current-head checks pass (two configured skips), including the hosted full-suite tests, build, typecheck, and all eight browser shards. There are no open review threads. ## Risks - Acquisition can succeed before preparation throws. Boundary tests verify that both the reservation and a transferred copy remain visible to the cleanup owner. - Callbacks can replace copy/save state during execution. Public tests verify saved receipts; direct tests verify the current run row, warm checkpoint receipt, and permission-root preservation. - Missing edit authorization and cleanup failure must remain nonfatal. Characterization tests revoke actual membership after dispatch admission and inject a cleanup error while preserving the saved result. - The browser uses a test-launcher-only instruction-capable wrapper around the real process adapter. Production adapter capabilities are unchanged. No live provider calls are made; native warm ownership is covered by focused module and native-session tests rather than a live provider browser run. ## Model Used OpenAI Codex, based on GPT-6, assisted with reasoning, code edits, tool execution, and verification. The exact deployment model ID and context-window size are not exposed in this session. ## 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>