Compact the embedded corpus trie - #57
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Introduce corpus format version 6 with unary trie degrees, sparse terminal heads, and byte-aligned 16-bit or 32-bit edge-token deltas. Regenerate the embedded corpus with the new encoding and reject invalid padding, widths, deltas, and terminal positions while decoding.
The compressed corpus falls from 12.62 to 12.11 MB and the decoded form from 41.70 to 30.09 MB. Combined with the failure-link change below it, corpus loading falls from about 664 to 394 milliseconds and cold matcher creation from about 714 to 448 milliseconds. Retained memory remains about 114.87 MB; transient cold-start allocation rises from 154.64 to 166.54 MB.