BEE-063: SYM index — symbol-mention rows, one prefix scan

Now
DONE
Sev
MED
Ask
gritzko
Rep
///bee
On1
DOG-047
See
LITE-033

New verb bee sym u8bFeed: every mention of a symbol across the registered tips, one prefix scan. A new lite record family: key SYM:4|sym_hl:40|types:20, val seg0..seg3:10|fn_hl:20|vnib:4, ONE ROW PER SYMBOL x FILE, verbatim hashing. The kind nibble sits in the key's TOP bits per DOG-047 (landed 2026-08-24), so EVERY kind owns a contiguous 1/16 range and the fat family never peppers a rev-lane page; no reserved all-ones kind is needed — SYM takes the next free value, 9. Suspects contract as LINK (LITE-033, INDEXES.mkd): a row says the symbol MAY be there, precision comes from opening the suspect, rows are never deleted.

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