[azooz2003-bit]

Upstream copy of the CmuxConversation part of #24202 (feat-cmux-next), so Packages/iOS/CmuxConversation stays byte-identical on both branches (the TestFlight builder checks for drift).

Cause. MessageCellLayout started the thread line beside the quote at its middle, which drew a hook out of the quote's leading side through its tail (user report in Chief, 2026-10-21).

Fix. The line comes from ConversationReplyThread (CmuxConversationGeometry). It drops from under the quoted bubble's tail (or, in a group, the avatar column beside an incoming quote), turns toward a reply on the other side level with the reply's middle, and ends in a short level run before the reply. A same-side reply gets a straight line that stops above it. The row keeps room for the quote's tail. Before/after against Messages, in both directions and light and dark: see #24202.

Tests. swift test --filter ConversationReplyThreadTests on a fleet mini: 6 tests with 13 issues on the old geometry, all pass now. All 255 CmuxConversationGeometryTests pass.

The macOS UI (MacConversationRows) has its own thread layout and is unchanged.

🤖 Generated with Claude Code

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Summary by cubic

Fixes the inline reply thread line in CmuxConversation iOS so it no longer draws a hook out of the quote's leading side through its tail.

• The ConversationReplyThread geometry drops the line from under the quote's tail (or a group's avatar column), turns it toward a reply on the other side level with the reply's middle, and ends in a short level run short of the reply; same-side replies get a straight line that stops above them.
• The line meets the reply's first piece of content, so a photo or file above the caption is never crossed.
• Rows now keep room for the quote's tail and for a same-side reply's straight line.
• Keeps Packages/iOS/CmuxConversation byte-identical with the feat-cmux-next branch's cmux-next iPhone: reply thread line, single Chief push, swipe actions close before the sidebar #24202, so the TestFlight drift check passes.
• Adds ConversationReplyThreadTests (6 tests, all failing on the old geometry) plus a new geometry suite (255 tests).

^{Written for commit 9d4ba66. Summary will update on new commits.}

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[blacksmith-sh]

Found 1 test failure on Blacksmith runners:

Failure

Test	View Logs
test_macos_ios_package_closure_matches_current_desktop_graph/ test_macos_ios_package_closure_matches_current_desktop_graph	View Logs

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[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Probably yours: Fast static checks failed: a static check failed, FAILED feature-flags (1.12s).

CI failed on 9d4ba666ad (run 39729413782 attempt 1): 1 code, 3 unknown.
macOS jobs did not run: compile and app tests were skipped: Fast static checks failure.

Job	Verdict	Why
Fast static checks	code	a static check failed
guards / workflow-guard-tests / quality-determinism	unknown	no known signature; failed step: Validate test determinism gate
guards / workflow-guard-tests / ci	unknown	no known signature; failed step: Propagate failed independent fast guard
tests	unknown	no known signature; failed step: Check platform workflow routing

Matched log lines

Fast static checks: FAILED feature-flags (1.12s)

Not re-run automatically: Fast static checks, guards / workflow-guard-tests / quality-determinism, guards / workflow-guard-tests / ci, tests are not machine failures.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

CI fast guards failed on 9d4ba666ad (https://github.com/manaflow-ai/cmux/actions/runs/39729413782). It does not block the merge; a red guard merged into main breaks it for every open PR.
The log named no failed step; see the run.

Agents: python3 scripts/ci/guard_attribution.py fix applies the mechanical fixes locally.

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[azooz2003-bit]

Review: the same correctness-first subagent review as #24202 (findings and fixes posted there: #24202 (comment)). This branch's package is byte-identical to #24202's head 3145bc8.

CI: the reds are base findings, not from this change (it only touches Packages/iOS/CmuxConversation). Fast static checks fails lint-feature-flags on two expired reviewBy dates in Sources/FeatureFlags.swift (agent-inbox-quick-view, conversation-sidebar), and the guards, ci-status, linux-preflight and tests follow it. The package's own tests passed on a fleet mini: swift test CmuxConversationGeometryTests 255/255.