iyi 0.13.0

The standard library is iyi. src/std is seventy-five modules and
36,269 lines written in iyi over the prelude — JSON, YAML, XML, HTML,
path, IO, unicode, big, regex, digest, base64, CSV, random, UUID, a heap,
HTTP with its verbs, DEFLATE with zlib and gzip, an option parser — and
they bind nothing but the platform: socket, time, file, dir and
udp reach the kernel by raw syscall on Linux and libSystem on darwin,
debug reads the program's own DWARF, and everything else is iyi over
the prelude's intrinsics, which bench/std_exercise.sh checks by
reading the source. What Crystal's library gets from zlib, PCRE, OpenSSL,
GMP and getaddrinfo is written here or absent on purpose: DEFLATE reads
72 of zlib's streams and zlib reads 18 of iyi's; the regex engine is a
Pike VM, linear and leftmost-first, held against Python's re on 2,214
pattern/subject pairs; the digests against hashlib. The Crystal socket
stack that had landed beside IyiSocket left, and so did iyi repl.

Then it was probed, and 65 defects were fixed where they lived. Nearly
a thousand programs against twelve modules found panics wearing the
prelude's sentence (a control character in YAML indexed an empty table,
pow(-1, Infinity) overflowed, a Char above U+00FF overflowed a block
gsub), wrong answers (Math.frexp landed past 1.0 for whole bands of
small magnitudes and every log-based function inherited it; a|ab
matched ab; round(TiesAway) moved an integer; from_json could not
read the UInt64 to_json wrote), and silent loss (a dedented YAML
entry dropped, base64 data after a = dropped, +99:99 accepted as an
offset). Each fix is held by the module's own gate, most against
Python's answer. Before that, the verbs were probed the same way:
seventeen of them have a gate now, the language server and the MCP
server answer a client's mistake with the protocol's code, a syntax slip
is a sentence rather than the token the parser wanted, and the stack
running out is a panic the program prints itself.

Twenty-nine pull requests from jwaldrip landed. The runtime's symbols
are __iyi_* for an iyi program and __crystal_* under --crystal; a
panic on darwin prints a backtrace that std/debug resolves to
file:line; twenty-two std modules arrived, eleven of them the ones the
rewrite had dropped, reinstated on the owner's call; a build-tool floor
names every host binary the build runs. Landing them found three things:
the prelude's __iyi_close declared no output for its syscall, so under
optimisation a second close in a row became a read; the ABI is
decided by the prelude that was loaded, not the entry's extension; and
file and dir had come calling libc on Linux, which the floor refuses,
so their Linux branches are raw syscalls now.

.iyimod is v50. See CHANGELOG.md for the rest.