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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work. > - An ephemeral web server must preserve historical task files outside its local disk. > - Archived isolated Git workspaces can have a successful branch-deletion receipt. > - Their private checkout can be gone while the project cache still owns the exact commit. > - The importer rejects that cache because it applies private-checkout validation. > - This pull request validates the managed object source for receipt-based restoration. > - The importer restores the recorded commit without using the current shared working tree. ## Linked Issues or Issue Description Refs #18826, #18943, #19038. **What happened?** An archived isolated workspace has a valid successful cleanup receipt and a retained commit. Offline migration rejects it with `archived_git_source_unavailable,local_source_unsafe_or_missing`. The private checkout was removed. The company and project cache still contains the exact commit. **Expected behavior** Restore the immutable commit from the verified project object cache. Keep strict validation for saved private edit recipes. Reject missing receipts, a foreign cache, a different origin and revoked cleanup authority. **Steps to reproduce** 1. Create an isolated Git workspace from a managed project cache. 2. Archive it and retain its successful branch-deletion receipt. 3. Remove its private checkout while the verified project cache retains that commit. 4. Attempt offline workspace migration. ## What Changed - Extract the existing managed Git object-source validator. - Use that validator only for exact successful deletion receipts that refer to a canonical company and project cache. - Keep private restore-point source validation unchanged. - Fetch immutable objects at the recorded commit into private scratch. Recheck receipt authority before publication. - Add real Git and database tests for restoration and rejected authority changes. Document the preservation path. ## Verification - 129 focused migration, concurrency and isolated-source tests pass across three files. - The new restoration case fails against the previous importer with the reported source-unavailable error. - Tests remove the old home and restore the retained commit. A newer shared working tree and unrelated files are excluded. - Tests reject a foreign company cache, wrong origin, missing receipt and receipt revocation during upload. - Local server typecheck has no diagnostics in changed files. Stale linked dependency declarations prevent a clean local whole-server result. Current-head full CI passes (54 passing checks, three skipped). Greptile is 5/5 with no unresolved review threads. - A replay of the 32 affected records is running in an isolated staging copy. Two committed owner overlays are under test. This is not released-image or serving-instance acceptance. ## Risks - A deletion receipt must identify an exact commit that still exists. Missing objects continue to block migration. - Shared working-tree contents must never substitute for archived private files. Only the recorded commit is fetched through this path. - The change does not recreate private edit authority, retire recovery records or alter serving configuration. ## Model Used OpenAI GPT-6.1 Codex, exact model ID `gpt-6.1-sol`. Used for reasoning, code editing, shell tools and test execution. The runtime does not expose its 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>