bogdan Harden Varia transcoding over NFS

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# Changelog

All notable changes to `garmin_varia_transcode.sh` are documented here.
Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).

---

## [Unreleased]

### Changed
- `--move-source` renamed to `--delete-source` (old name kept as alias)
- `--continue-on-error` renamed to `--keep-going` (old name kept as alias)
- `--unattended` automatically enables input staging when `--staging-dir` is set
- Source and destination preflight checks now fail before staging/scanning when
	source or destination NFS/autofs mounts are unreadable or unwritable
### Added
- `--unattended` preset (`--delete-source` + `--keep-going`) for long unattended runs
- `--staging-dir DIR` to place intermediate transcoding temp files on a fast local path,
	with automatic fallback to destination temp files when staging is unavailable
	or lacks sufficient free space for the current file
- `--stage-input` to copy each source video to staging before encoding, which avoids
	long ffmpeg reads directly from flaky NAS/autofs mounts
- automatic RAM disk creation on macOS when `--staging-dir` points to a missing
	`/Volumes/<Name>` path, configurable with `--staging-ramdisk-mb N`
- `--debug-timing N` to stop after N video files and print timing statistics for quick profiling

- `cleanup_garmin_varia_media_folder.sh` helper for media-folder hygiene (import + transcoded output):
	removes AppleDouble artifacts (`._*`), removes zero-size MP4 files,
	and normalizes single-suffix duplicate timestamp names

### Behavior
- Import cleanup returns exit code `1` when duplicate groups are blocked and need manual review

## [1.0.0] — 2026-05-04

Initial release.

### Added
- Batch HEVC transcoding with `hevc_videotoolbox`, `libx265`, or `libx264`
- Encoding modes: `hardware`, `auto`, `quality`, `compat`
- Default mode: `hardware` (hevc_videotoolbox on macOS)
- Recursive directory traversal (default on)
- Directory structure preservation at destination
- Per-file audio detection via ffprobe; AAC 128k output when audio present
- HEVC outputs tagged `hvc1` for Apple Photos / QuickTime compatibility
- `-map_metadata 0` and `-movflags +faststart`
- Source file timestamp preservation via `touch -r`
- `--move-source`: delete source only after codec + duration validation
- `--no-overwrite`: skip existing output files
- `--no-recursive`: restrict to top-level directory
- `--dry-run`: print actions without writing files
- `--verbose`: full per-operation logs and ffmpeg/ffprobe output
- `--crf`: override CRF value for software modes
- `--extensions`: configurable video extension list
- Auto single-file mode when `--source` is a file path
- Quiet default output: one progress line per file with elapsed seconds
- Summary line with counts and timing after each run
- Destination-inside-source guard (hard error)
- At-least-one-of `--source`/`--destination` requirement
- Fail-fast: encoding chain stops on first ffmpeg error
- Bash 3.2 compatible (macOS system bash)