fraisier-adapter-support

Shared building blocks for fraisier's in-process adapters. Intentionally policy-free — it provides mechanism, each adapter keeps its own interpretation.

• run_command — spawn a subprocess, capture stdout/stderr/exit code, and turn a spawn failure into a tagged AdapterError. A process that runs and exits non-zero is returned as Ok(Captured); the caller maps the exit code to its own AdapterErrorKind. Used by the shell-out adapters (command, systemd).
• retry_on_err — retry an async fallible operation up to N times with a fixed delay, returning the first Ok or the last Err. Used by the network adapters (http health, release artifact download).

Depends on fraisier-core only (for AdapterError); it never depends on fraisier-ipc.