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/commands/show.mli

@@ -0,0 +1,45 @@
+type target =
+  | By_id of Cli_primitive.db_id
+  | By_ids of Cli_primitive.db_id Rrbvec.t
+  | By_uuid of Cli_primitive.uuid
+  | By_page of string
+
+type opts = {
+  id_raw : string option;
+  uuid : Cli_primitive.uuid option;
+  page : string option;
+  page_hierarchy : bool;
+  linked_references : bool option;
+  ref_id_footer : bool option;
+  level : int option;
+  stdin_id : string option;
+}
+
+type parsed = Parsed_show of opts
+
+type action = {
+  repo : Cli_primitive.repo;
+  graph : Cli_primitive.graph;
+  target : target;
+  multi_id : bool;
+  linked_references : bool;
+  ref_id_footer : bool;
+  page_hierarchy : bool;
+  level : int option;
+}
+
+type linked_references = { count : int; blocks : Block.t Rrbvec.t }
+
+type tree_data = {
+  root : Block.t;
+  linked_references : linked_references option;
+  referenced_uuids : Cli_primitive.uuid Rrbvec.t;
+  uuid_to_entity : (Cli_primitive.uuid * Entity.t) Rrbvec.t;
+  breadcrumb_line : string option;
+}
+
+val normalize_stdin_id : string option -> string option
+val resolve_target : opts -> target Error.build_result
+val invalid_options : opts -> string option
+
+include Command_spec.S with type parsed := parsed and type action := action