feat(runtime): add Devin CLI ACP runtime

[249469326i-lang]

Summary

Adds Devin CLI (Cognition / formerly Windsurf) as a supported coding-agent runtime, following the exact same pattern as the Trae CLI adapter (PR #12).

Note: Windsurf was rebranded to Devin Desktop on 2 June 2026. The CLI binary is now devin, not windsurf. This PR targets the current product.

Changes

• New agent def: packages/runtime/src/defs/devin-cli.ts

  • id: 'devin-cli', name: 'Devin CLI'
  • streamFormat: 'acp-json-rpc'
  • bin: 'devin', versionArgs: ['--version']
  • buildArgs() returns ['acp'] — starts the ACP JSON-RPC server over stdio

• Registry: registered in AGENT_DEFS after traeCli

• Test: packages/runtime/test/devin-cli.test.mjs — validates registration + ACP args

• READMEs: updated agent count (13 → 14), added to all agent tables in both EN and CN READMEs

ACP protocol reference

devin acp is the official ACP stdio subcommand documented at cli.devin.ai. It speaks JSON-RPC 2.0 over stdin/stdout — the same transport used by Trae CLI (traecli acp serve --yolo) and Open Design AMR (vela agent run --runtime opencode).

From the official ACP registry config:

{ "cmd": "devin", "args": ["acp"] }

Requires the user to have run devin auth login at least once, or to have WINDSURF_API_KEY set in the environment.

Verified

• tsc -p packages/runtime/tsconfig.json --noEmit passes ✅

[lefarcen]

Hey @249469326i-lang 👋 — thanks again for the clean follow-up from #20; your closing comment there saved everyone the cycle. ❤️

Quick lifecycle nudge: main has moved ahead a handful of commits since you opened this (including the Remotion adapter that landed today), and the PR is now showing merge conflicts. Could you rebase against main when you have a moment? Once the conflicts are resolved, @PerishCode will pick this up for review — no action needed from him until then.

No rush, just wanted to make sure this didn't quietly slip off the board.

[lefarcen]

Internal lifecycle note (for maintainer visibility):

• 7 days since last author activity (June 8 nudge about conflicts)
• Conflicts remain: README agent list line (main has 'Windsurf CLI' text from author's merged PR docs: add CONTRIBUTING.md and improve local setup instructions #19, but no actual Windsurf implementation; this PR adds the correct post-rebrand 'Devin CLI' implementation)
• Escalated to @PerishCode in 群 — team can either rebase this or close+redo fresh

Technical assessment: PR is sound (follows Trae CLI pattern exactly, test coverage included, rebrand reasoning is correct — Windsurf → Devin happened June 2).