Summary

• make the UI recorder event loop compute its receive timeout from actual pending work instead of waking every 100ms while idle
• remove the Windows element-context bridge polling loop by blocking on the UIA result channel until data or disconnect
• downgrade hot success/skip logs (frame_linker successful pairs and content-dedup skips) from INFO to DEBUG to avoid default stdout work during normal input bursts

CPU / wakeup notes

• UI recorder idle receive wakeups drop from 10/sec to about 1/sec when there is no pending batch or scroll-stop deadline.
• Batch flush and scroll-stop latency are preserved by waking at the nearest pending deadline.
• Element-context bridge idle wakeups drop from 10/sec to zero; it now wakes only on click-context messages or UIA sender disconnect.
• Final local profile (screenpipe record, audio/telemetry/keyboard/clipboard/snapshot-compaction/meeting-detector disabled) stayed low in typing/scrolling and quieted the prior default INFO spam:
  • typing avg: 1.689% of one core
  • scrolling avg: 1.153% of one core
  • idle_post avg: 0.354% of one core

Test plan

• cargo fmt
• ORT_SKIP_DOWNLOAD=1 cargo test -p screenpipe-a11y platform::windows::tests::test_permission_check --lib
• ORT_SKIP_DOWNLOAD=1 cargo test -p screenpipe-engine ui_recorder::event_batch_tests --lib
• ORT_SKIP_DOWNLOAD=1 cargo test -p screenpipe-engine frame_linker::tests --lib
• ORT_SKIP_DOWNLOAD=1 cargo build --release -p screenpipe-engine --bin screenpipe