* 🧵 feat: Native Background Execution for Code Interpreter Tools
* 🩹 fix: Address Codex Round 1 (fallback dedupe, harvest failure, handle parsing)
* 🩹 fix: Live Completion Marker + Unkeyed Attachment Dedupe (Codex Round 2)
* 🎨 chore: Sort Imports + Widen Marker Type Comparison (CI)
* 🩹 fix: Stale-Harvest Guard, Error Marker Status, Faster Anchor Retry (Codex Round 3)
* 🧹 refactor: TS Harvest Module, Claim-Neutral Timestamps, Error Parity (Codex Round 4)
* 🩹 fix: Dispatch-Ordered Stale Guard, Foreground Downgrade, Error Wrapper Parity (Codex Round 5)
* 🩹 fix: Retry Past Unfinished Rows + Per-Call Attachment Dedupe (Codex Round 6)
* 🩹 fix: Writer-Dispatch Ordering, Scoped Live Upserts, Reaped-Task Wrapper (Codex Round 7)
* 🩹 fix: Wildcard toolCallId Matching for Bare Attachment Updates (CI)
* 🩹 fix: Claim-Insert Dispatch Stamp (Schema-Backed) + Scoped Status Markers (Codex Round 8)
* 🩹 fix: Pre-Write Ownership CAS + Agent-Scoped Part Patching (Codex Round 9)
* 🩹 fix: Insert-Path Ownership CAS + Agent-Routed Attachments (Codex Round 10)
* 🩹 fix: Agent-Scoped Marker Ids and Attachment Dedupe (Codex Round 11)
* 🩹 fix: Atomic File Commit and Sibling Preview Fan-Out (Codex Round 12)
- Replace the two-step claim-confirm CAS with an atomic conditional updateFile: the ownership predicate (no sourceDispatchedAt, or <= this write's dispatch order) moves into the update filter, removing confirmCodeFileOwnership and the lost-update window between check and write
- Thread agentId through createDownloadFallback so fallback download rows scope to the emitting agent like primary rows
- Fan terminal preview overlays out to every live attachment sharing the file_id in useAttachmentPreviewSync (sibling tool calls no longer stick on pending)
- Restore background artifacts through toStoredArtifact so the size bound applies on re-anchor
- Apply filterAttachmentsForPart to grouped tool-call attachments in ContentParts so handoff agents with colliding provider call ids do not cross-contaminate groups
* 🩹 fix: Agent-Scoped Live Upserts and Monotonic Dispatch Stamps (Codex Round 13)
- Scope the SSE attachment upsert and the useAttachments DB/live merge by agentId with the same wildcard semantics as toolCallId: distinct non-null agentIds stay separate entries, so handoff agents sharing a claimed file_id and a repeated provider tool id (call_0) no longer merge over each other's cards
- Extend the attachment identity key to fileKey::toolCallId::agentId and register less-specific key variants so bare and agent-less live records still dedupe after overlay
- Stamp background task createdAt from a strictly-increasing per-process dispatch counter: raw Date.now() can tie for same-millisecond dispatches and the stale-output guard accepts equal stamps (needed for idempotent re-commits), which would let an older task overwrite a newer task's committed file
