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* feat(desktop): isolate pnpm dev:desktop per worktree (MUL-3724) Two worktrees could not run pnpm dev:desktop at once: both grabbed the renderer port 5173 and the single-instance lock keyed by the app name "Multica Canary". The env hooks to override each already existed (DESKTOP_RENDERER_PORT in electron.vite.config.ts, DESKTOP_APP_SUFFIX in src/main/index.ts) but nothing derived per-worktree values. A new dev launcher (scripts/dev.mjs) derives both from the worktree path for linked worktrees only — reusing the same cksum%1000 offset as scripts/init-worktree-env.sh, so renderer port is 5173+offset and the app becomes "Multica Canary <folder>" with its own userData/lock. The primary checkout is untouched; explicit env vars still win. Backend targeting is unchanged (apps/desktop/.env*). Also: brand-dev-electron honors the suffix, turbo globalEnv passes it through, and CONTRIBUTING documents the flow. Co-authored-by: multica-agent <github@multica.ai> * fix(desktop): make worktree dev port/suffix collision-safe (MUL-3724) Addresses code review on #4598: - Renderer port base 5173 → 5174 so a worktree whose offset is 0 (e.g. cksum("/tmp/multica-3494") % 1000 === 0) no longer collides with the primary checkout's default 5173. - DESKTOP_APP_SUFFIX is now "<folder>-<offset>" instead of just the folder name, so worktrees that share a basename at different paths (or names that slug to the same fallback) get distinct single-instance locks. Without it the second Electron was still blocked by the shared lock. - Tests: offset-0 port guard, and same-basename-different-path disambiguation. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: Lambda <agent@multica.ai> Co-authored-by: multica-agent <github@multica.ai>