R02: P3: live capture and reward panel

Go implementation tracking epic

Selected stack: Go + Wails v2 + React/TypeScript + SQLite. Implementation starts on the next machine. Each child below is a separate PR; do not implement this epic in one PR.

Child tasks

• R02a: Wayland live capture adapter
  • Merged prerequisites: R01b, F02a.
  • Acceptance: R5/R6: selected portal source, bounded frames, stop/revoke/cancel cleanup and no retained images; real desktop evidence on claimed Wayland targets.
• R02b: X11 capture adapter and fallback
  • Merged prerequisites: R01b, F02b.
  • Acceptance: R5/R8: explicit supported X11 capture; unavailable capability yields image-import/normal-window fallback; manual evidence and cleanup tests.
• R02c: Capture controls and reward lifecycle
  • Merged prerequisites: R02a, R02b.
  • Acceptance: R5/R8: user starts/stops scan; no duplicate/stale reward sessions; memory/latency and focus evidence; real game verification only when separately authorized.

Workflow

See TASKS.md, ROADMAP.md, and CONTRIBUTING.md. Aim for 100-400 handwritten changed lines per PR; split above 600 unless inseparable. Merge prerequisites before dependents. Update task evidence and this checklist after each completed PR. Close this epic only when every child passes; optional work can remain deferred.

All tasks are not started. Live game access and publication/merge actions follow the user's explicit authorization. The planning handoff does not claim runtime validation.

Start with TASKS.md, ROADMAP.md, and CONTRIBUTING.md, then verify prerequisites R01b, F02a, and F02b before choosing a child task. Treat R02a, R02b, and R02c as separate PRs; use each listed acceptance criterion and desktop or manual evidence as the definition of done, and close the epic only after all children pass.