Nimbo v0.1.0.136

• fix(engine): safe pair mutations before Run, watcher drain on stop, transport connection timeouts
• chore: keep Claude harness files out of public tracking
• feat(mobile): Android gomobile facade with hardened binding contract
• fix(build): restore go.sum module hashes; anchor x/mobile against tidy
• fix(gui): adopt the Nextcloud theme colour in windows opened before sign-in
• docs(store): v0.1.2 listing refresh - sync-led copy + app-windows screenshots
• feat(gui): Nextcloud apps as desktop app windows