feat: complete structured CLI output

- unify human, plain, and JSON CLI output modes

- standardize diagnostics, lifecycle events, colors, quiet, and verbose handling

- preserve argument forwarding and improve CLI help and summaries

- document and release version 0.9.5

man/man1/dcr-add.1

@@ -25,6 +25,9 @@ Generic git repository.
 .B path:./path/to/lib
 Local path dependency.
 .TP
+.B pkg-config:name
+System pkg-config dependency (also accepts \fBpkg:\fR or comma-separated packages).
+.TP
 .B <version>
 Version from registry.
 .SH OPTIONS