chore: remove accidentally committed variadic scratch files (#201)

`test_variadic.lg` and `debug_variadic.lg` are identical 2-line scratch
files that landed in the repo root via #85 alongside the lginterop work.
Nothing in the Makefile, scripts, or source references either of them.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

chore: prepare v1.9.0 release (#130)

* chore: prepare v1.9.0 release

* ci: exclude lowered Go artifacts from lint

chore: prepare v1.8.0 release (#73)

Update sort compatibility gates

Fix sort comparator compatibility

Strip ANSI escapes on plan9

rio doesn't render ANSI escape sequences, so the colored error reporter
and the legacy test macro's PASS/FAIL labels showed up as literal
[1;31m / [32m garbage on plan9.

Fix in two layers:

  - Go-side error formatter (pkg/vm/errfmt.go) now uses tagged
    constants. New pkg/vm/ansi.go (!plan9) holds the real escapes;
    pkg/vm/ansi_plan9.go (plan9) stubs them to "". errfmt.go
    concatenates the constants instead of inline \x1b literals.

  - Let-go-side: a new core var *ansi?* (default true) signals whether
    the host renders ANSI. term_plan9.go's installTermNS flips it to
    false on plan9. The legacy `test` macro now picks plain or colored
    PASS/FAIL labels based on *ansi?*. core_compiled.lgb regenerated.

Enhance runtime system properties: add os-name, arch, user-name, host…

…name, and version metadata

Enhance syscall support: add seccomp and AppArmor functions; implemen…

…t mknod, prctl, and capset syscalls; update tests for JSON write functionality

Enhance loop and let compilers to support PersistentVector bindings

Regenerate precompiled core for v1.5.0