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This PR introduces integration tests that run [codex-shell-tool-mcp](https://www.npmjs.com/package/@openai/codex-shell-tool-mcp) as a user would. Note that this requires running our fork of Bash, so we introduce a [DotSlash](https://dotslash-cli.com/) file for `bash` so that we can run the integration tests on multiple platforms without having to check the binaries into the repository. (As noted in the DotSlash file, it is slightly more heavyweight than necessary, which may be worth addressing as disk space in CI is limited: https://github.com/openai/codex/pull/7678.) To start, this PR adds two tests: - `list_tools()` makes the `list_tools` request to the MCP server and verifies we get the expected response - `accept_elicitation_for_prompt_rule()` defines a `prefix_rule()` with `decision="prompt"` and verifies the elicitation flow works as expected Though the `accept_elicitation_for_prompt_rule()` test **only works on Linux**, as this PR reveals that there are currently issues when running the Bash fork in a read-only sandbox on Linux. This will have to be fixed in a follow-up PR. Incidentally, getting this test run to correctly on macOS also requires a recent fix we made to `brew` that hasn't hit a mainline release yet, so getting CI green in this PR required https://github.com/openai/codex/pull/7680.