FutureOS 1.0.8

What's Changed

• test(cli): bring future-cli coverage to ~98.6% (parts 1-10) by @huichen in #146
• test(loop): future-loop coverage 77.72% → 98.43% lines + 4 runtime bug fixes by @huichen in #148
• test(agent): drive future-agent coverage 84.4% → 96.8% by @huichen in #149
• test(cli): future-cli coverage 98.6% → 99.84% lines (residual push) by @huichen in #147
• test(channels): coverage 31.50% → 100% lcov DA (99.84% summary lines) by @huichen in #150
• test(cli): eliminate spawn_mock port-steal/startup races by @huichen in #151
• Worktree linux prebuilt release by @ace331 in #152
• Claude/linux static cli by @ace331 in #153
• Claude/install cdn by @ace331 in #154
• feat(mobile): add attachment transfer and previews by @tallcode in #157
• Claude/publish installers fix by @ace331 in #156

Full Changelog: v1.0.7...v1.0.8