feat(openkal): the two consumers move to 0.9.0 with it

[Sunrisepeak]

The two packages that consume openkal, moved to 0.9.0 with it.

package	version	was	what changed
riscv-virt-rt	0.6.0	0.5.2	its openkal implementation adopts the 0.9 surface, and is now exercised
std-freestanding-alloc-kal	0.1.2	0.1.1	a repin; nothing on the allocation path changed

Follows #275, which added
openkal 0.9.0 and the eight packages that implement or stand on it.

riscv-virt-rt 0.6.0

It supplies openkal's core set — abort, stream, memory — behind
features = ["openkal"], so it is an implementation and not only a consumer.
Three things follow from 0.9:

• transfers are one signed word; a partial write that then fails reports the
  count, because the bytes reached the device and a caller told kal_err_io
  would send them twice;
• kal_memory_granularity answers 1 — no memory management unit, no
  rounding, so every address and every length is acceptable;
• kal_version and kal_interfaces are exported, and the latter claims exactly
  those three.

⚠️ Nothing called any of it before. The feature compiled the sources and the
linker took all fourteen names into the test binary, so nm showed them and the
suite was green — proving it compiles and links, and saying nothing about what it
answers. tests/openkal.cpp now asks, on both ISA profiles, and was measured to
fail when the answers are wrong.

std-freestanding-alloc-kal 0.1.2

kal_alloc and kal_free are unchanged in 0.9.0, so the package is a repin.
Writing it exposed that its manifest dependency catches a version mismatch
and not a declaration one — it declares the two itself rather than including
openkal's header. Continuous integration now compiles both against the header
they came from.

What was checked

Both source tarballs were downloaded from both hosts and compared byte for
byte against the file the checksum was taken from. Both descriptors parse as Lua
afterwards and carry the version in all three OS tables with the same checksum,
checked on the parsed table rather than by searching the text.