fix: cut long names from the middle, not the end

The shortening fitted the path and destroyed its meaning. Lidarr writes
"Artist - Album - 07 - Flamethrower.mp3" inside a directory already named for
that artist and album, so a long album title occurs three times in one path and
everything that distinguishes one track from another sits at the very end.
Cutting from the end removed precisely that:

  King Gizzard & the Lizard Wizard - PetroDragonic Apocalypse; or, Dawn of Eter~c526.mp3

All seven tracks on that record reduced to the same string bar the hash. The
path fitted; the result was seven files nobody could tell apart on the device,
which is a worse outcome than the failure it replaced.

Cut from the middle instead, giving two thirds of the remaining room to the
tail because the head is generally a restatement of the directory the file
already sits in:

  King Gizzard & the Lizard~c526~ginning of Merciless Damnation - 07 - Flamethrower.mp3

The eight real paths that prompted this are now regression tests: every track
on that album keeps its number and title, all seven names stay distinct, and
The Beatles' "The Long One" -- whose length is the title itself rather than a
repeated album name -- keeps both ends.

README.md

@@ -246,10 +246,26 @@ from `--max-path` to get what a mirror-relative path may spend.
 Over-budget paths are shortened from the **deepest component outward**: the
 track name carries the least navigational value and the artist directory the
 most, so the filename goes first and the artist is touched only if nothing else
-will do. A shortened component keeps its extension and gains four hex digits of
-the original name — two long names sharing a prefix would otherwise cut to the
-same string, and a silent collision between two tracks is worse than an ugly
-filename.
+will do.
+
+A component is cut **from the middle**, not the end, because of how these names
+are built. Lidarr writes `Artist - Album - 07 - Flamethrower.mp3` inside a
+directory already named for that artist and album, so a long album title
+appears three times in one path and the informative part — the track number and
+title — is at the very end. Cutting from the end throws exactly that away:
+
+```
+before  King Gizzard & the Lizard Wizard - PetroDragonic Apocalypse; or, Dawn of Eternal
+        Night - An Annihilation of Planet Earth and the Beginning of Merciless
+        Damnation - 07 - Flamethrower.mp3
+after   King Gizzard & the Lizard~c526~ginning of Merciless Damnation - 07 - Flamethrower.mp3
+```
+
+Two thirds of the remaining room goes to the tail, since the head is usually a
+restatement of the directory it sits in. A shortened component gains four hex
+digits of the original name: two names sharing both a head and a tail would
+otherwise produce the same string, and a silent collision between two tracks is
+worse than an ugly filename.
 
 The result is stable: the same source always produces the same shortened name,
 so a pass does not rename what the previous pass wrote. A path too deeply