ASC CLI 5.4.0 hardens agent workflows

As autonomous coding agents increasingly take over deployment pipelines, CLI tools must transition from permissive human-facing wrappers into deterministic, fail-closed state machines—and asc 5.4.0 sets the benchmark.

• –**Fail-Closed Primitives:** Refusing unsafe partial successes and aborting mutations whenever identity or envelope responses are uncertain prevents autonomous agents from compounding errors.
• –**Bypassing Web Consoles:** Terminal support for V2 Server Notifications and Sign in with Apple keys eliminates some of the final remaining manual hurdles in Apple's Developer Portal.
• –**Actionable Disambiguation:** Replacing ambiguous failure exits with bounded candidate IDs and exact disambiguation flags enables AI agents to self-correct rather than crash.
• –**Hardened Caching & Credentials:** Enforcing private 0600 permissions, strict cookie domain scoping, and rejecting symlinked cache entries protects headless credentials across shared CI/CD runners.