test: provide an isolated public library regression lane

Run workspace tests, doctests, Clippy, consumer builds and Python regression tests through one command with per-stage logs and explicit completion status. Exclude private input/exporter overrides and document the separate native lab lane.

Validated from versioned inputs alone: 171 Rust tests, six doctests, 117 Python regressions and all build/lint checks. Verify missing-tool failure and refusal to overwrite retained results.

Assisted-by: gpt-6-astra
06457c4d53clover caruso committed on 9/8/2026, 2:45:52 AMparentaabbadf
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