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/spec/core/output.mli

@@ -0,0 +1,35 @@
+type human
+type json
+type edn
+
+module Mode : sig
+  type _ t = Human : human t | Json : json t | Edn : edn t
+  and packed = Packed : _ t -> packed
+
+  val default : human t
+  val of_string : string -> packed option
+  val to_string : 'a t -> string
+  val structured : 'a t -> bool
+end
+
+module Human_output : sig
+  type t
+
+  val create :
+    ?headers:string Rrbvec.t ->
+    ?footer:string ->
+    rows:string Rrbvec.t Rrbvec.t ->
+    unit ->
+    t
+
+  val to_string : t -> string
+  (** format as table.
+      - columns need to be aligned
+      - empty row value display as '-'
+      - humanize created-at/updated-at *)
+end
+
+type _ t =
+  | Human : Human_output.t -> human t
+  | Edn : Melange_edn_melange.any -> edn t
+  | Json : Melange_edn_melange.any -> json t