epazote / epazote / 27266706947

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Fix flaky env-var tests: share one lock across test modules

commands and dispatch tests each had their own ENV_LOCK, but environment
variables are process-global and tests run in parallel, so the locks did
not exclude each other and EPAZOTE_* mutations raced (test_handler could
parse while another test set EPAZOTE_VERBOSE). A shared cfg(test)
cli::test_env module now provides the single lock, the EnvVarGuard, and
lock_and_clear_cli_env (which also clears EPAZOTE_BIND, previously
missed by the dispatch test). The lock recovers from poisoning so one
panicked test does not cascade.

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4958 of 5334 relevant lines covered (92.95%)

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