feat(lifecycle/cli): run native commands with selected modules (#16)

Add native urfave/cli command adapters with explicit module selection,
signal-aware execution, reverse cleanup and documented exit-code mapping.
Include focused tests, an executable example and the accepted CLI ADR.

Closes #8

README.md

@@ -63,6 +63,27 @@ for at least two signals, and subscription cleanup. Nil signals disable receptio
 There are no signal subscriptions, process exits, external dependencies or CLI
 integration in this package.
 
+## lifecycle/cli
+
+`go.auvem.com/corestack/lifecycle/cli` adapts native `urfave/cli/v3` commands.
+Bind `Serve(config, modules)` to run selected services, or `Action(config, modules,
+fn)` for a one-off with selected setup/cleanup and module services suppressed.
+See the [executable serve/inspect example](lifecycle/cli/example_test.go).
+
+`Run(ctx, cliRoot, args)` accepts argv including the program name and returns the
+exit code and inspectable error: success/help/graceful first signal is 0, usage is
+2, and runtime/lifecycle failure is 1. Runtime failures dominate mixed errors.
+Run prints diagnostics without exiting; the caller owns process exit. Nil signals
+subscribe to SIGINT/SIGTERM during adapted actions; injected channels stay caller
+owned. The private lifecycle App does not expose managed-worker admission.
+
+Use fresh command trees and leave `ExitErrHandler`, `OnUsageError` and
+`CommandNotFound` unset; Run owns those hooks. Other native hooks run outside the
+adapted lifecycle action. Native environment/custom validation and generated-help
+parse failures can return 1 with native diagnostics; custom pre-lifecycle
+validators may return `urfavecli.Exit(err, 2)` for usage. Help and flags use native
+urfave/cli declarations, without a configuration or environment facade.
+
 ## Status
 
 No support is guaranteed. Breaking changes, including to the format rules, may happen before 1.0 and are listed in the release notes.