agra ab3c9202ff test: run example corpus in zig build test; sx ir → stdout ...

`zig build test` now runs the full examples/ + issues/ regression corpus
alongside the Zig unit tests, driven by a pure-Zig test
(src/corpus_run.test.zig) — no shell script in the build path. It spawns
the installed `sx` per example (subprocess-isolated, per-run timeout),
diffs stdout/stderr/exit and optional `sx ir` snapshots, and fails the
build on any mismatch. The file list is enumerated at runtime, so new
examples are covered with no test edit.

- `sx ir` / `ir-dump` now write to stdout (fd 1) instead of stderr, so
  the dumps can be piped/redirected.
- `zig build test -Dupdate-goldens` regenerates snapshots in-build,
  byte-identical to the legacy `run_examples.sh --update`; on mismatch
  the runner prints how to regenerate.
- run_examples.sh kept (still used by tools/verify-step.sh) and made
  portable to a bare macOS: timeout/gtimeout fallback, bash 3.2-safe
  empty-array handling.
- CLAUDE.md: document the new workflow.

2026-06-13 09:41:56 +03:00

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