test: make tooling fixtures portable on macOS

[wolfiesch]

What changed

• create canonical, short-lived test directories across macOS and Linux
• keep realistic OMP socket names without exceeding the macOS UNIX socket path limit
• make maintainer preflight fixtures reach their intended assertions on macOS
• preserve production-root and symlink-escape security coverage

Root cause

macOS exposes its default temporary directory through a noncanonical /var/folders path, and its UNIX socket path limit is shorter than the generated gateway fixture path. Several Linux-focused preflight fixtures also assumed Linux-only commands were installed on the host.

Impact

pnpm test:tooling now runs cleanly on macOS without changing production gateway or maintainer behavior.

Verification

• mise exec node@24.17.0 -- pnpm test:tooling — 292 passed, 2 platform skips
• mise exec node@24.17.0 -- pnpm check
• mise exec node@24.17.0 -- pnpm test
• git diff --check

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Improves cross-platform reliability of the tooling/maintainer test fixtures by creating canonical temporary directories (especially on macOS) and adjusting fixtures to avoid macOS UNIX socket path-length and host-tooling assumptions.

Changes:

• Added a shared helper to create short, canonical, realpathed temporary directories across platforms.
• Updated tailnet gateway and maintainer tests to use the canonical temp helper and to better align with macOS constraints.
• Adjusted maintainer fixtures to use the test proc-root environment variable expected by maintainer scripts and to avoid relying on Linux-only host commands.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripts/test-temporary-directory.mjs	Introduces a helper to create canonical temp directories for tests (macOS-friendly).
scripts/tailnet-gateway.test.mjs	Uses canonical temp directories for gateway fixtures to keep socket paths within macOS limits.
scripts/t4-maintainer-integration.test.mjs	Uses canonical temp dirs for deploy fixtures; canonicalizes production-root temp path; uses test proc-root env var.
scripts/t4-maintainer-contract.test.mjs	Uses canonical temp dirs and adds stubs/PATH adjustments to keep preflight assertions portable on macOS.

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