Fix the Iroh branch Rust formatter gate

[lawrencecchen]

Formats four inherited Rust files with the pinned cmux-tui toolchain so the exact-head hosted gate can reach the Iroh tests. Retains the already merged PR 9837 hosted verification files as a separate infrastructure commit.

Verification: hosted exact-head gate pending. No local Cargo commands were run.

---

^{Need help on this PR? Tag @codesmith-bot with what you need. Autofix is disabled.}

---

Note

Medium Risk
Changes are mostly CI and developer workflow; risk is moderate due to workflow complexity and the exact-commit dispatch contract, not runtime product logic.

Overview
This PR unblocks the Iroh formatter gate and lands the hosted cmux-tui verification stack on top of it.

Rust formatting (gate fix): Several inherited cmux-remote / cmux-remote-mobile files are reformatted with the pinned toolchain. A cfg(test) buffered_state helper on message streams replaces direct lock access in mux tests.

Single toolchain source: cmux-tui/rust-toolchain.toml (1.95.0 + clippy/rustfmt) and a composite setup-cmux-tui-rust action install that toolchain in workflows instead of ad hoc rustup versions.

Hosted verification entry point: scripts/verify-cmux-tui-hosted.sh requires a clean, pushed HEAD, dispatches cmux-tui.yml with commit, mode (focused / full), optional test_filter, and request_id, waits for the run, prints failures, and downloads the macOS arm64 binary to cmux-tui/target/hosted/<commit>/. AGENTS.md documents that local Cargo on Lawrence's Mac is not used for verification.

cmux-tui.yml: Manual-only workflow_dispatch with input validation (SHA must match workflow revision). Full mode adds web frontend, sharded Valgrind, clippy, isolated cmux-tui-core tests via run-cmux-tui-core-tests-isolated.py**, binding e2e, and a called **cmux-tui-build-package** job; **focused** mode runs filtered workspace tests on Linux and macOS plus a slimmer artifact build (**macos-arm64** only). Concurrency is per **request_id` so parallel commits do not cancel each other.

Packaging workflow: cmux-tui-build-package.yml adds plan-build (dynamic target matrix, target_set, runner overrides), Ghostty Zig version from scripts/ghostty-zig-version.sh, macOS cross-builds via native cargo build (not cargo-zigbuild), optional Cloudflare relay, and native Linux arm64 package verification instead of QEMU.

SDK CI: New cmux-tui-sdks.yml runs protocol/SDK contract checks, per-language package and consumer matrices, and seven-language live conformance against a headless cmux-tui build.

^{Reviewed by Cursor Bugbot for commit 1e2d4b2. Bugbot is set up for automated code reviews on this repo. Configure here.}

---

Summary by cubic

Restores the exact-commit hosted cmux-tui gate and fixes the Iroh Rust formatter gate. Uses one pinned Rust toolchain across all jobs, completes hosted coverage (sharded Valgrind with rustls-scoped ring suppressions and a memory‑instrumented transport workload, isolated core tests incl. ignored), and aligns packaging; no runtime changes.

• New Features

  • Hosted verification: cmux-tui.yml validates an exact commit, supports focused/full, runs filtered workspace tests in focused mode (executes ignored), isolates cmux-tui-core tests (also runs ignored), shards Valgrind with a final aggregator and memory-instrumented transport checks, runs Ghostty VT replay and bindings e2e, and builds dogfood artifacts (focused: macos-arm64; full: all targets). Concurrency is per request_id. Workflow helpers (composite action + scripts) are checked out at the workflow SHA to stay consistent when building another ref.
  • Tooling/entry points: pinned toolchain via cmux-tui/rust-toolchain.toml and reusable setup-cmux-tui-rust; scripts/verify-cmux-tui-hosted.sh dispatches, enforces pushed exact-commit verification, streams failures, and downloads the macOS arm64 binary. Docs: cmux-tui/AGENTS.md, cmux-tui/CLAUDE.md.

• Refactors

  • Packaging: dynamic targets (target_set) with runner overrides; macOS cross via Xcode, Linux cross via cargo-zigbuild, native Linux arm64 package verification, Ghostty Zig version auto-resolved, and Cloudflare DO relay built under the same pinned toolchain (wasm32-unknown-unknown). Rust code: applied pinned rustfmt; added #[cfg(test)] MessageStream::buffered_state() and updated tests; scoped service test imports.

^{Written for commit d540ea6. Summary will update on new commits.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: c12b7b8b-3bc1-479d-9450-264faf6561d0

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 4babe08. Configure here.}

[cursor]

Experimental Windows blocks package publishes

Medium Severity

build-windows still describes an experimental artifact, but this change drops continue-on-error. Callers such as nightly and release set include_windows: true and treat the reusable workflow result as a publish gate, so a Windows GNU flake or failure now fails the whole package workflow and blocks npm/PyPI publishing.

 

^{Reviewed by Cursor Bugbot for commit 4babe08. Configure here.}

[cursor]

Bugbot is paused — on-demand spend limit reached

Bugbot uses usage-based billing for this team and has hit its on-demand spend limit.

A team admin can raise the spend limit in the Cursor dashboard, or wait for the next billing cycle to continue.

[cursor]

Bugbot is paused — on-demand spend limit reached

Bugbot uses usage-based billing for this team and has hit its on-demand spend limit.

A team admin can raise the spend limit in the Cursor dashboard, or wait for the next billing cycle to continue.

[lawrencecchen]

Closing this stale stacked branch. The Iroh mobile transport was replaced by merged #10889, with pairing and relay follow-ups in active branches #11431, #10963, and #11071. This non-main stack is no longer a merge target.