v0.3 (unreleased)

Fork of Crowbar, renamed to Alcobar.

• Alcotest-compatible API: test_case, run, and suite exports replace the old add_test/run_test interface.
• --gen-corpus DIR flag to generate seed corpus files from passing test runs, removing the need for a separate gen_corpus.ml.
• Per-test timeout (ALCOBAR_TIMEOUT env var, --timeout flag).
• Per-test time budget (--budget flag).
• GitHub Actions CI.