Initial import of LogDarioSeq baseline

Establishes version control for the personal Logseq DB fork before
starting the server-client architecture migration and domain features
described in docs/agent-guide and the approved implementation plan.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

cli/lib/output_mode.ml

@@ -0,0 +1,18 @@
+type t = Output.Mode.packed
+
+let all =
+  [
+    Output.Mode.Packed Output.Mode.Human;
+    Output.Mode.Packed Output.Mode.Json;
+    Output.Mode.Packed Output.Mode.Edn;
+  ]
+
+let default = Output.Mode.Packed Output.Mode.Human
+let of_string = Output.Mode.of_string
+let to_string (Output.Mode.Packed mode) = Output.Mode.to_string mode
+let structured (Output.Mode.Packed mode) = Output.Mode.structured mode
+let merge_preference xs = Vec.find_map (fun x -> x) xs
+let for_config config = Option.value config.Cli_config.output_format ~default
+
+let error ?command ?context mode err =
+  Cli_result.error ?command ?context mode err