feat(plugins): unify realtime device viewers for Codex and WorkBuddy - #101

Summary

Codex and WorkBuddy now open a real-time Android viewer beside the chat and require a visible decoded video frame before the first observation or action. Viewing continues after the control task ends and releases video resources when the last viewing page closes.

• Add independent viewer lifecycles, shared scrcpy 4.1 H.264 streams, bounded buffering/reconnection, and device-bound first-frame receipts in each plugin.
• Integrate native host opening through Skills, preserve task/device isolation and action safeguards, and fix WorkBuddy 5.5.3 Hook input binding compatibility.
• Prepare video resources during installation, retain recovery records, and update candidate versions to Codex 0.2.0 / protocol 3 and WorkBuddy 0.3.0 / protocol 8. DSH is unchanged.

Validation

• Re-run before submission: Codex pnpm check — 80 tests, build and validation passed.
• Re-run before submission: WorkBuddy npm run check — 138 tests, build and validation passed.
• Implementation-stage evidence includes real H.264 browser tests, four synthetic streams over 30 minutes, installer checks, and limited native Codex / domestic WorkBuddy phone checks. These are distinct evidence scopes, not full final-package acceptance.
• Detailed results and limitations: candidate acceptance record.

Remaining acceptance — draft

Real overseas WorkBuddy, two-phone isolation, phone rotation / frame rate / end-to-end latency, real-device 30-minute stability, complete host stop/reconnect/restart combinations, and Codex installed Skill discovery / real downgrade remain unverified. The final decoder-reset change passed browser tests but has not been reinstalled and retested in WorkBuddy; the final package has not repeated the complete 30-minute soak.

No phone is currently available, so hardware acceptance is paused. Candidate packages were produced locally; this PR does not publish packages or claim release readiness.