v0.6.0: the flock archive

This release changes how long videos get made. Instead of rendering every
frame of a long export in one shot (a 5-genome sequence at top quality took
over 3 hours), Emberweft now keeps an archive of pre-rendered loops and
edges, and composes long videos from those files. Material is rendered once
and reused forever: a fully cached sequence stitches in seconds.

How you use it

• The new Flock area in the app has three tabs. Generate pre-bakes loops and
  edges into the archive. Stitch composes the long video: it tells you up
  front how much is already cached versus what it will render, then hands you
  the finished file. Browse shows what you have, per shard, with sizes and
  thumbnails.
• Everything sources from your library: your favorites, your collections, or
  whatever you have selected. No file pickers.
• Pick the quality once (Standard is the default and is fast; genome-default
  is the mastering tier) and how many times each loop plays. The archive
  upgrades itself: re-rendering at higher quality replaces the old file
  rather than adding a duplicate.
• Progress is honest: per-video frame counters, an ETA, a running indicator
  in the sidebar, and a Cancel that takes effect within a couple of frames.

A real Mac app

Emberweft now ships as Emberweft.app with its own icon. Double-click it and
it opens, with no Terminal window left behind. The CLI is unchanged and sits
beside the app.

Also in this release

• Stitched videos no longer jump at segment boundaries (the frame-to-frame
  difference at every seam now matches a one-shot export).
• Generation is dramatically faster (renders were quietly using the genome's
  ~1000 temporal samples instead of the chosen tier's).
• Electric Sheep genomes keep their real generation and id in the archive.
• One-shot export moved out of the playback windows into the library
  selection, with a default quality in Settings.
• You can create collections and add to them from anywhere.
• New CLI: emberweft flock generate | stitch | browse | rebuild |
  export-list, including an Electric Sheep list XML export.

Download the zip, unzip it, and drag Emberweft.app to /Applications (or run
it in place; keep the emberweft CLI next to its bundle if you use it). The
first launch of a downloaded copy may need:
xattr -dr com.apple.quarantine Emberweft.app

Engine parity, determinism, and the animate/export byte-identity guarantees
are unchanged.