feat: add bounded Quantum cabinet extraction

tests/fixtures/README.md

@@ -96,6 +96,43 @@ so decoding it without folder history fails.
 This fixture establishes block-history behavior only. It is not a OneNote
 export and is not evidence of `.onepkg` producer compatibility.
 
+## Inline compcol Quantum fixtures
+
+`src/onenote/onepkg/quantum/decoder.test.ts` copies two small Quantum payloads
+from compcol
+[`tests/quantum.rs`](https://github.com/KarpelesLab/compcol/blob/04a6db2aa7bd487a89c559631d79d1b384139f50/tests/quantum.rs)
+at commit `04a6db2aa7bd487a89c559631d79d1b384139f50`. The 48-byte
+`qtm.txt` payload decodes with an 18-bit window to the 59-byte ASCII string
+`If you can read this, the Quantum decompressor is working!` followed by a
+line feed. The first two compressed blocks of compcol's multi-frame zero-run
+fixture are 14 and 6 bytes and decode to two 32,768-byte zero frames. Tests
+exercise arithmetic-model and LZ-window continuity, per-block synthetic
+sentinels, malformed trailers, truncation, cancellation, and operation limits.
+
+The immediate reviewed compcol source is MIT-licensed; its exact licence is in
+`LICENSES/compcol-MIT.txt`. The compcol comments record that the payloads were
+originally extracted from libmspack CAB test files. This repository copies only
+the small arrays published in the pinned compcol test source, not those CAB
+files.
+
+`src/onenote/onepkg/cabinet.test.ts` wraps the 48-byte payload in a generated,
+single-folder CAB so the actual CAB enumeration, checksum, and extraction path
+is covered:
+
+- CAB compression type: `0x1222` (Quantum level 2, 18-bit/256 KiB window).
+- CFDATA sizes/checksum: 48 compressed bytes, 59 output bytes, checksum
+  `0x4bec2dfd`.
+- CAB size: 124 bytes.
+- CAB SHA-256:
+  `f622c5a8f5a000dfaddc5569750344f5a6e35d0de9fbd3c4f0c8720c7d94d291`.
+- Wrapper/header/filename licence: original test data under this project's
+  MPL-2.0 licence; embedded payload licence: compcol MIT as above.
+
+The frozen CAB contains only the compressed payload; the decoder appends the
+required `0xFF` byte after each CFDATA block in memory. These are CAB-level
+codec fixtures, not OneNote exports, and do not establish producer-specific
+`.onepkg` compatibility.
+
 ## Distribution policy
 
 The decoded fixture bytes are used only by tests. Vite does not copy them into