CHANGELOG: the partition limit that D15 removed and the one it left

CHANGELOG.md

@@ -73,7 +73,7 @@ Notable changes to `samplerdisc`. Format-level findings live in [docs/formats/](
 - **AIFF-C is refused, and no disc exercises a reader for it.** Nothing in the collection is AIFF-C, so there is nothing to check one against; a compressed payload written out as PCM would open, play as noise, and report nothing wrong. Same for 8-bit AIFF, where the sign convention differs from WAV's and carrying it would change the sample values.
 
 - **`AMG - Kickin' Lunatic Beats 2 AKAI CD1.mdx` is an incomplete image, and nine of the 669 files it yields are wrong.** It is short of the disc it was made from by four 32 KB blocks, so everything past the first gap has slid: the last nine files of `13-TRACK 06` extract audio belonging to other samples, with payload headers that no longer match the names their directory gives them. The container decodes every block the file does contain correctly — the file is not a complete copy of the disc, which two independent structures agree on. Nothing detects this yet; that is [#23](https://github.com/bmxcode/samplerdisc/issues/23). If you have extracted that disc, treat its last volume with suspicion, and prefer a fresh rip.
-- **Only the first partition of an AKAI disc is read.** Partitions are laid end to end at multiples of the size declared at `0x00`, and they hold real content — `Advance Orchestra` declares 7680 blocks of an image of 66 616, with a second partition's volume directory sitting right where the first ends. Most AKAI discs therefore list a fraction of what they hold. The format doc has said to walk the partition table since it was written and nothing does; the measurement is now in it, and the work is [#22](https://github.com/bmxcode/samplerdisc/issues/22).
+- **A declared partition the image has no header at is skipped, never searched for.** Nine of the 44 AKAI discs are short of the disc they were made from, and on those the missing header sits *earlier* — displaced by a whole number of the container's own 32 KB blocks, accumulating down the disc, from 4 blocks on `Best Service - Alpha Dance I` to 7 288 on `AKAI.S3000.Sound.Library.7`. Roughly fifteen thousand readable files stay unread on those images, which is deliberate rather than a gap in the walk: a search would find their partitions, and the audio inside a short image is displaced by the same missing blocks that moved the header — the nine wrong files above are the standing evidence of what displaced audio extracts as. `list` prints how many partitions the disc declares against how many the image holds, so the shortfall is a stated fact and not an absence. ([docs/formats/akai-fs.md](docs/formats/akai-fs.md), [ADR-0023](docs/adr/0023-partitions-come-from-the-table-the-disc-declares.md), [#25](https://github.com/bmxcode/samplerdisc/issues/25))
 - **100 of `Studio Essentials`'s 230 banks list without extracting.** They have no confirmed sample directory, and carry a note saying so rather than being guessed at. That disc holds 901 `E4P1` presets and preset-only banks are the likely explanation — likely is not established, so it is not claimed.
 - **An E-mu bank whose `0x34` is damaged will list empty and say the header declares no sample area.** The field bounds the walk now, so the note that follows an empty bank restates that bound rather than corroborating it independently — the note is true about the header and would be wrong about the bank. The alternative was measured and is worse: `protozoa`'s index bank would be credited with 63 of the Phatt banks' records. ([ADR-0021](docs/adr/0021-a-bank-owns-the-run-its-header-declares.md))
 - **Loop points and root key are still absent from E-mu WAVs.** Eight fields in the 92-byte sample header are undecoded and some are very likely those. Decoding them changes the *shared* record parser and would alter every E-mu sample already extracted, so it is its own piece of work rather than a rider on this one.