vbpf / prevail / 26372764981

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Use COW shared_ptr for per-domain cell registry

The per-domain cell registry (introduced in the previous commit)
caused a 15-20% regression on heavy programs: every EbpfDomain copy
deep-cloned the registry, and every lattice join merged cell maps
that were already identical.

Introduce a generic Cow<T> wrapper (src/crab/cow.hpp) that enforces
copy-on-write through the type system: operator*/-> give const access;
get_mutable() detaches when shared. This eliminates the class of bugs
where a detach_cells() call is accidentally omitted — mutable access
is only possible through get_mutable(), which handles the COW dance.

Also return get_pre/get_post by const ref to avoid unnecessary copies
in join_all_prevs, and drop the now-unused array_domain.hpp include
from analysis_context.hpp.

Measured on cilium-core/bpf_host.o cil_host_policy:
  before: 0.50s  →  after: 0.42s (matches pre-refactor baseline).

Signed-off-by: Elazar Gershuni <elazarg@gmail.com>

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