fix(relay): own the grep pattern before spawning the runner task

[lawrencecchen]

chatmux-relay has not compiled on main since #11568 merged: the grep arm's spawned task captured pattern, a &str borrowed from the request frame, so the 'static future held a borrow of frame and empty_args (E0597 at the unwrap_or(&empty_args) binding, E0521 at the tokio::spawn). Every cmux-tui.yml job failed at build on main, for example https://github.com/manaflow-ai/cmux/actions/runs/33616280724, and the open follow-up #11629 fails the same way (https://github.com/manaflow-ai/cmux/actions/runs/33618595740).

Fix: own the pattern as a String before the spawn and move it into the argv. Two lines, no behavior change.

Hosted focused run on this head, all green (Linux, macOS, MSRV 1.91, aarch64 release build): https://github.com/manaflow-ai/cmux/actions/runs/33619939294

#11629 touches the same block and will need origin/main merged in after this lands.

https://claude.ai/code/session_01AvkeWizggvvUAngHyB7JUQ

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Summary by cubic

Fixes chatmux-relay not compiling on main by owning the grep pattern as a String before the spawned task runs.

• The task no longer borrows from the request frame, resolving the E0597/E0521 errors.
• No behavior change; the grep argv now moves the owned pattern instead of cloning it.

^{Written for commit ee1f7ba. Summary will update on new commits.}

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Project	Deployment	Actions	Updated
cmux166	Building	Preview	Sep 2, 2026 10:38am UTC
cmux41	Building	Preview	Sep 2, 2026 10:38am UTC

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• cmux-tui/crates/chatmux-relay/src/actions.rs

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[lawrencecchen]

Requesting approval: main has not compiled in chatmux-relay since #11568 (every cmux-tui.yml job fails at build). This is the two-line fix with a green focused run on the exact head (https://github.com/manaflow-ai/cmux/actions/runs/33619939294) and a clean local review gate. The main ruleset now requires approval from someone other than the last pusher, so lawrencecchen cannot land it alone.

[lawrencecchen]

Superseded by #11629, which carries this pattern-ownership fix together with bounded cancelled-child reaping on the current main base. Keeping this PR open would duplicate the same change.

[lawrencecchen]

Superseded by #11653 (same fix, merged as 3214964); GitHub stopped updating this PR's head after the branch moved.