agra 88c4cbcfa5 test harness: add -Dname to scope the corpus to specific examples ...

`zig build test -Dname=examples/0625-foo.sx[,examples/0626-bar.sx]` runs ONLY the
named example(s) — full repo-relative .sx paths, comma-separated (a leading `./`
is tolerated). Empty = run everything (unchanged default).

Why: a full `-Dupdate-goldens` re-runs and rewrites all ~690 snapshots, so one
flaky/host-divergent example (AOT links, cross-arch `target` examples) can clobber
a good snapshot. `-Dname` regenerates only the named example(s) and touches
nothing else. It also busts the cached test-run result — the corpus enumerates
.sx/expected files at runtime, so a bare snapshot edit alone is otherwise served
from cache.

- build.zig: new `name` option threaded onto corpus_paths.
- corpus_run.test.zig: `nameMatchesFilter` + a per-example skip in the run loop.
- CLAUDE.md: document the targeted-regen workflow under Snapshot integrity.

2026-06-17 14:55:06 +03:00

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