Cancel LRC conversations after Stop takeover

[vkodithala]

Description

Fixes the LRC Stop cancellation path that can leave an Agent Mode conversation marked InProgress after the user stops a monitored long-running command.

This PR:

• treats Ctrl-C in a Stop/user-control LRC state as conversation cancellation.
• still writes Ctrl-C to the PTY so the underlying command is interrupted.
• preserves transfer/manual user-control behavior by sending Ctrl-C to the PTY without cancelling the conversation.
• adds focused regression coverage for Stop takeover vs. transfer takeover.

This is the first PR in a two-PR stack. The follow-up PR handles the agent-requested command focus / early Ctrl-C race.

For context, this was reported by ZL here and is a pretty trivial repro (tell an agent to run a long-running command, ctrl-c, ctrl-cin sequence to cancel the subagent and then the command, notice that a "Warping..." is still visible.

Linked Issue

N/A

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

Demo of how this works end-to-end, along with a short explainer: https://www.loom.com/share/4654d825c946467ebaf92d800b7e8926.

• ./script/format
• git --no-pager diff --check
• cargo nextest run -E 'test(ctrl_c_after_stop_takeover_cancels_conversation) | test(ctrl_c_after_transfer_takeover_does_not_cancel_conversation)'
• cargo clippy --workspace --all-targets --all-features --tests -- -D warnings — not rerun after splitting; earlier attempt in this checkout was blocked in app/build.rs while downloading Sentry.xcframework because gh returned Bad credentials (HTTP 401).
• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-BUG-FIX: Fixed an issue where pressing Ctrl-C to stop a command monitored by Warp Agent could leave the conversation stuck showing “Warping…”.

Co-Authored-By: Oz oz-agent@warp.dev

[vkodithala]

• Handle early Ctrl-C for requested commands #12617
• Cancel LRC conversations after Stop takeover #12623 👈 (View in Graphite)
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[oz-for-oss]

@vkodithala

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[oz-for-oss]

Overview

This PR updates Ctrl-C handling for agent-monitored long-running commands so a second Ctrl-C after a Stop takeover cancels the associated local Agent Mode conversation while still interrupting the PTY, and it adds regression coverage for Stop vs. transfer takeover behavior.

Concerns

• No blocking correctness, security, or spec-alignment concerns found in the annotated diff. The PR description includes Loom visual evidence for the user-facing behavior.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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