Fibers, channels, and GC runtime

Closed 2026-05-20 on superrepo f57377a (v0.2 delivery tip).

Spawn/fiber runtime surfaces, channel primitives, vendored abfall GC heap integration, runtime module alignment, and platform-spec GC/interop alignment.

Workstreams: codegen-runtime. 9 catalog tasks anchor this deliverable (milestoneId: v02-concurrency-runtime).

Provenance

• 12ee673 (compiler) — feat: spawn/fiber runtime, channels, and split System I/O surfaces
• 3a9a083 (corelib) — corelib: syscall surfaces, docs, and tests
• 0ded628 (compiler) — compiler: runtime/ABI updates, doc command, corelib submodule bump, tests
• 6ecd493 (compiler) — feat(runtime): vendored abfall GC and Beskid heap integration
• 6db12d2 (corelib) — fix(ci): run corelib prelude lowering tests on an 8 MiB stack
• ee3d83d (corelib) — feat(corelib): expand syscall coverage and stdlib tests
• 2ddddb3 (corelib) — test(corelib): extend concurrency tests and align concurrency packages
• 4e5bfca (compiler) — docs(abfall): document Beskid vendoring and upstream repository link
• …and 1 more seed tasks with provenance commits.

Catalog scope

• Delivery version: v0.2 (Analysis, packages, and platform spec)
• Deliverable: v02-concurrency-runtime — Fibers, channels, and GC runtime

Relation

Groups the v0.2 seed tasks linked via milestoneId for Fibers, channels, and GC runtime.