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Connex Client AccessandClaude Opus 5
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`bin/gstack-evidence` has a `#!/usr/bin/env bun` shebang, and bun AUTO-LOADS `.env`, `.env.<NODE_ENV>` and `.env.local` from the cwd into `process.env`. The wrapper then spawned the command with no `env` override, so every command run through it inherited those variables — and a repo `.env.local` routinely holds production credentials. Two things go wrong, and the second is worse than the leak: 1. Secrets reach a child that would not otherwise have them. `npm test` run by hand in the same shell sees none of them; the same command through the wrapper sees all of them. 2. THE COMMAND UNDER TEST BEHAVES DIFFERENTLY, so the ledger certifies a run that is not the run CI performs. Observed in a Next.js repo on 2026-08-20: four tests failed 4/4 through the wrapper and passed 5/5 without it, because app code branched on env vars only the wrapper supplied. Nearly an hour went into chasing a "flake" that was the measuring instrument. The wrapper exists to record trustworthy evidence, so silently altering the environment defeats its purpose. The fix builds the child env from `process.env` minus the keys bun injected, and detection is exact rather than heuristic: verified on bun 1.3.11, a dotenv file does NOT override a variable the shell already exported (the shell's value wins). So a key whose live value equals the dotenv file's value was injected by bun, and dropping it restores the environment the user's own shell would have given the command. A key whose live value differs is genuinely the caller's and survives. `BUN_DOTENV_FILES()` mirrors bun's precedence, including that `.env.local` is skipped when NODE_ENV is "test" — scrubbing a key bun never loaded would strip a variable the caller legitimately provided. Escape hatch: GSTACK_EVIDENCE_KEEP_DOTENV=1 keeps the old behaviour. When keys are scrubbed the wrapper warns with the KEY NAMES ONLY, so the diagnostic cannot become the leak it prevents. Tests: 6 cases, mutation-verified — removing `env: spawnEnv` reddens exactly the two leak tests and restoring it gives 30/30. Every leak test asserts the scrub warning fired, because `bun test` sets NODE_ENV=test and the first version of these tests passed vacuously against a `.env.local` bun had never loaded. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Absorbed from PR #2652 with authorship preserved. Wave additions: a doc-comment on the ${VAR}-expansion limitation (bun expands refs, the reader compares raw text — those keys are left in the child env, failing open) and a regression pin for the unreadable-.env fail-open path with a functional DAC-override skip guard. Fixes #2624