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* test(threads): add red R3/R4 merge ordering regressions * fix(threads): preserve trusted seq positions through content merge (R3/R4) Extract the message ordering/identity logic into a pure core/threads/message-order.ts module. Each normalized identity now tracks latest visible content and trusted position separately: content replacement no longer drops deerflow_seq/run_id/turn_duration (R3), and a seq-carrying live message is placed by the ascending seq skeleton instead of the next shared identity anchor (R4: 1,3,2,5 -> 1,2,3,5). buildVisibleHistoryMessages converges repeated identities to the earliest visible feed row (mirroring backend get_message_seqs), and the summarization transient bridge plus rendered ledger share the same position priority: trusted seq outranks anchor weaving, bridge refreshes keep known seqs, and hidden control copies never contribute a visible position. * test(e2e): add long-thread ordering regression with compaction and pagination Add tests/e2e/thread-ordering.spec.ts: a deterministic 68-row, 33-turn fixture with two hidden compaction summaries, a paginated /messages/page mock, and a live compaction during submit (real SSE frame shapes). Asserts DOM group order at stage barriers, outline/scroll navigation across the virtualized list, tool-card association, and order stability across reload. Also close three mock gaps in mockLangGraphAPI (token-usage, mcp-tasks, workspace-changes): unmocked they fell through to the absent gateway and the 401 redirected thread pages to /login, breaking every thread-page spec in a gateway-less Playwright environment. * test(threads): address review on ordering regression coverage - e2e: actually expand the collapsed web_search step and assert the intermediate result payload (realistic JSON array fixture); assert the new turn's DOM relative order via compareDocumentPosition instead of racing viewport coordinates; add a Custom Agent route regression sharing the same paginated fixture. - Add a unit test for the hidden-control-only seq fallback path. - Keep isNonEmptyString in hooks.ts (message-order.ts does not use it). - Document the seq-first position authority contract in frontend/src/AGENTS.md. * test(threads): type run_id fixtures via getMessageRunId accessor * test(e2e): exercise the real collapsed-steps region for the tool payload check The previous toolStep.click() was a no-op: as the last tool call, the web_search step rendered unconditionally. Add a second tool call to the turn-30 fixture so web_search falls into the collapsed moreSteps region, assert the intermediate result payload is hidden while collapsed, then click the "1 more step" button and assert it becomes visible. * docs(frontend): prettier-format AGENTS.md merge contract * fix(frontend): anchor mixed-sequence message segments * test(auth): include project permissions in me contracts * fix(frontend): anchor trailing steps to positioned live results * fix(frontend): preserve prefixes before rescued sequence anchors