- Store SSH tunnel child in static Mutex (was dropped immediately)
- cmd_bao: use env(1) for VAULT_TOKEN instead of sh -c (no shell injection)
- Cache API discovery across kube_apply documents (was per-doc roundtrip)
- Replace blocking ToSocketAddrs with tokio::net::lookup_host
- Remove double YAML->JSON->string->JSON serialization in kube_apply
- ResultExt::ctx now preserves all SunbeamError variants
SunbeamError enum with typed variants (Kube, Config, Network, Secrets,
Build, Identity, ExternalTool, Io, Json, Yaml, Other) each mapping to
a process exit code. ResultExt trait replaces anyhow's .context().
main.rs initializes tracing-subscriber with RUST_LOG env filter and
routes all errors to exit codes via SunbeamError::exit_code().
Removes anyhow dependency.
