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## Thinking Path > - Paperclip publishes agent progress and results back to chat. > - Some updates replace an earlier message while others need a new message. > - The current outbound link and task generation determine that authority. > - These decisions are spread through the large chat service. > - This PR groups publication replacement and supersession decisions in one module. > - Reviewers can follow those decisions without reading provider transport code. ## Linked Issues or Issue Description Refs #15836, #15834 and #15823. Stack slice 4 of 5, based on `codex/chat-identity-links`. Merge the predecessor first, then retarget this PR. Do not merge the stack out of order. Stack order: #15823 (provider messages) → #15834 (resource reconciliation) → #15836 (identity links) → #15844 (publication replacement) → #15845 (failed-run retries). GitHub native stack merging preserves this order and automatically restacks the remaining branches. ## What Changed - Extract shared publication replacement and supersession queries from the large service. - Keep exact outbound ownership, run/wake scope, consumed progress, interaction replacement and retained-source authorization together. - Put the iMessage typing-versus-progress policy in `imessage-photon/publications.ts`. - Preserve endpoint lookup timing and all ownership query bodies. The multi-provider close allowlist remains shared dispatch metadata. - Restack onto the revised #15836 and record why this boundary remains mostly shared. ## Verification - The same 49 existing publication and Photon integration cases passed before and after the provider-policy move. Other cases were excluded by the filter. - Cases cover close-owned progress, ambiguous delivery, interleaved Slack control, Telegram confirmation, FIFO replacement and Photon channel behavior. - Server typecheck, module-boundary and whitespace checks passed. Only the iMessage predicate/reason moved; ownership queries are unchanged. - Historical server shard 2 hit a cleanup deadlock; its unchanged [isolated rerun passed](https://github.com/paperclipai/paperclip/actions/runs/38134431077/job/114457999409). [Original failure](https://github.com/paperclipai/paperclip/actions/runs/38134431077/job/114455332022). - Tests use disposable databases and fixture provider transports, not live third-party execution. - Fresh Greptile review is 5/5 on `8e2da97b6dc11eb446128b61c789edb529c50d5a`, with a successful check and no open review threads. - Final-stack `pnpm -r typecheck` and `pnpm build` passed at `57ec5ba94aecd860471f9b14db46f99120c7c790`. - Historical pre-restack CI failed on `ci / General tests (server (11/12))` and its aggregate `ci / verify`. All 1,255 tests passed, but worker-exit cleanup in unchanged `server/src/__tests__/setup-supertest.ts:32` failed with EACCES removing a temporary `paperclip-vitest-home-*` directory. The [original job](https://github.com/paperclipai/paperclip/actions/runs/38256549828/job/114836065382) and the [single unchanged rerun](https://github.com/paperclipai/paperclip/actions/runs/38256549828/job/114839735273) failed the same way. No further reruns were requested. After GitHub automatically restacked the branches, the full cumulative run on #15845 passed this server shard. This middle PR uses the repository’s policy-only stack CI scope; the top PR runs all suites. - The final full-local-suite outcome for this cumulative stack is recorded in #15845; do not infer that gate from the focused tests above. - Merge verification on the restacked tree: 118 focused identity, publication, Photon and retry integration tests passed; server typecheck and module-boundary checks passed. GitHub’s rebased trees exactly match the previously reviewed file contents. - All current-head required checks passed on `8e2da97b6dc11eb446128b61c789edb529c50d5a`: policy CI (middle-stack scope; full cumulative suites passed on #15845); Greptile 5/5 with no unresolved threads. ## Risks - Splitting shared ownership queries per channel would duplicate authorization rules. They remain in the shared module. - Preserve the issue-to-run lock order and retained-source callback. The factory creates no worker or mutable state. - This PR depends on #15836. Merge and retarget in stack order. ## Model Used OpenAI Codex, GPT-6 family, with reasoning and repository tools. The exact runtime model ID and context-window size are not exposed in this session. No separate agent was used. ## 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 - [ ] 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>