kernel: authoritative host-injected VA->PA pins (ipin table) + wider pin table

The CE push-buffer page 0x120000000 resolved to a zero-filled page even after
sema_map_add injected the correct translation: the shared pin table silently
dropped inserts once a hash cluster exceeded the 32-probe window (the page
hashes to slot 0, a hot cluster), and lookups fell through to the
content-scanned map and answered with a stale page - so every CE push read as
implausible and memset stayed 0. Injected translations now live in a separate
authoritative table checked before every other source and are never written by
self-discovery; the general pin table is 4x larger with a 4x probe window and
counts drops (pin_drop/ipin_drop) in the stats line. guest_kprobes.sh disables
the kprobe group before removal (EBUSY) and matches p:kprobes/<name>; the
guest wait sampler can run counters-only with GDB=0.

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