mori (development version)

The C layer is now vendored from mizu (ALTREP view layer) and libmizu (shared-memory region layer) via tools/vendor.sh; the string region layout is now Arrow large_utf8-shaped.
Region layouts now open with a 64-byte header.
share() now supports S4 objects built on vectors or lists (previously the S4 object bit was silently dropped).
share() of attribute-heavy objects and nested lists is faster: the write pass no longer re-serializes each element just to measure its size.
Fixed type confusion on unserialize when a shared string's content resembled a shared memory identifier (e.g. a stored shared_name() value).
Fixed a forked child process (e.g. parallel::mclapply) unlinking the parent's live region when garbage-collecting an inherited shared object.
Corrupted regions now raise a clean R error on map_shared() or access instead of reading out of bounds or crashing R.

mori 0.2.2

Region name counters now start at a per-process random value, so a process reusing a crashed process's PID no longer collides with its orphaned regions (#50).

New prune_shared() removes shared memory regions orphaned by a process that was killed before it could clean up (#25).
When share() fails to create a shared memory region it now reports the requested size and, where applicable, an actionable hint (e.g. raising a container's /dev/shm limit) instead of a generic message (#29).

Wire-format change (breaking): The serialization format and the shared memory region naming scheme have both changed.
shared_name() and map_shared() now round-trip for sub-lists and extracted elements, not just whole shared objects. Sub-object identifiers carry a bracketed index path (e.g. /mori_abc_1[2,3]).
shared_name() now returns NULL for non-shared inputs (previously the empty string ""); shared_name(x) %||% "" retains the previous behaviour.
share() on Linux fails with a clean R error when /dev/shm is too small (typical in containers, where the limit can be raised at start) instead of SIGBUS-ing mid-serialize (#14).
map_shared() on Linux no longer prefaults the whole region, restoring lazy first-touch access to match macOS.