fibers B1.2: Io capability + context.io + blocking impl + Future/async/await/cancel
Threads an `Io` capability onto `Context` exactly like `Allocator`: a
`protocol #inline` whose process-wide default is a stateless `CBlockingIo`
(the mirror of `CAllocator`), installed in `__sx_default_context`.
Library (library/modules/std):
- core.sx: `Io` protocol (spawn_raw / suspend_raw / ready / poll / now_ms /
arm_timer) + `SpawnOpts` / `PinTarget` / `ParkToken`; `Context` gains an
`io: Io` field LAST (allocator stays index 0, data stays index 1).
- io.sx (new): `CBlockingIo` + `impl Io` (blocking M:1 semantics — now_ms is
a real monotonic clock, the rest are no-ops/0; suspend never called);
`Future($R)` { value; state: FutureState; err: IoErr; park; task; canceled:
Atomic(bool) } with `Value :: R`; the async ergonomic layer
`async` / `async_void` / `await` (value-carrying `(R, !IoErr)`) / `cancel`.
Built with the verified `= ---` + field-assign + `Closure(..$args) -> $R` +
`..$args` idiom (NON-void $R only — Future(void) is deferred per issue 0150).
- std.sx: re-export the Io surface + the io.sx tail.
Compiler (src/ir):
- protocol.zig `emitDefaultContextGlobal` + comptime_vm.zig
`materializeDefaultContext`: both materializers of `__sx_default_context`
now build the inline CBlockingIo->Io vtable (7 words) at the new field.
- stmt.zig `lowerPush`: `push Context.{...}` now INHERITS omitted fields from
the ambient context (seed the slot from current_ctx_ref, overwrite only the
literal's named fields) — correct capability-bag semantics, so the partial
`push Context.{ allocator = X }` sites don't zero a null `io` vtable.
- protocols.zig + lower.zig + error_analysis.zig: record protocol-impl method
names so the "declared `!` but never errors" lint skips a conforming impl
whose `!` is dictated by the protocol contract (e.g. Io.suspend_raw).
37 `.ir` snapshots regenerated: layout-only (the Context type now carries the
Io field, shifting type-table numbering); no stdout/stderr/exit changes.
The blocking Io + now_ms + Future/async work when `async` is called with the
receiver passed explicitly; the user-facing UFCS form `context.io.async(...)`
is blocked on a separate UFCS generic-inference bug (filed next).
Suite: 726 ran, 0 failed.
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