[aardappel]

Goose is a systems language that compiles to C: data lives
on bump-allocated data stacks freed by scope, arrays nest inline, and links can be 4-byte
relative references, with lifetimes and bounds checked statically where they can be and at run
time where they can't.

This adds Goose programs for every problem except http-server (Goose has no networking yet):
30 programs for 17 problems, a single-threaded one for each and a -m one where the fast
programs of other languages are multithreaded.

Build. goose -O2 --standalone -o app.c app.goose writes the program and the runtime as one C
file, which clang @app.rsp compiles with the C entries' flags (-O3 -fomit-frame-pointer -march=broadwell). Goose's simd fns, which otherwise also build AVX-512 versions and pick one at
run time, are capped at AVX2 (-DGS_SIMD=1) to match -march=broadwell. .github/goose.sh
installs a Goose release, as odin.sh does Odin's.

Notes on the programs

• binarytrees builds each tree in a pool local to the function that builds it, freed when that
  function returns, as the C and C++ programs use memory pools. merkletrees forbids arenas, so
  there every node is allocated and freed on its own, from a pool with a freelist.
• coro-prime-sieve: Goose has no coroutines, so it builds the chain the generator programs (C#,
  D, Python) build: a lazy filter stage per prime, each pulling values from the stage before it.
• pidigits, edigits and secp256k1 carry their own big-integer code, since Goose has no bignum
  library; json-serde uses Goose's standard json module and carries its own MD5.
• fasta uses the prescribed LCG as written; knucleotide/1 counts in its own hash table as C's
  1.c does, knucleotide/2 with the standard library's dictionary.
• nbody/1 and spectral-norm/1 are the plain algorithms; nbody/2 and spectral-norm/2 lay the data
  out for vector registers (spectral-norm/2 sums four columns' fractions over one division, as
  C's 6-im does).

Testing. With the tool, --task build --langs goose builds all 30 programs and --task test
passes all 58 unit tests (Ubuntu 24.04, clang 18). The same programs also build and pass with
Ubuntu 22.04's clang 14, and with clang 20.