Observers now own segment directories: create HHMMSS_draft/ folders during recording, write files with simple names (audio.flac, center_DP-3_screen.webm), then atomically rename to HHMMSS_LEN/ on completion. This eliminates complex file movement in transcribe/describe handlers. Key changes: - Linux/macOS observers: draft folder creation and atomic rename on boundary - transcribe/describe: process files in-place, skip if output exists - sense: expect files in segment dirs, removed SEGMENT_KEY env var - remote ingest: create segment dirs, strip legacy prefixes from filenames - Removed unused is_draft_segment() and macOS filename properties 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>