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/id_parse.ml

@@ -0,0 +1,31 @@
+type parsed = { ids : Cli_primitive.db_id Rrbvec.t; multi : bool }
+
+let valid_id id = Int64.compare id 0L > 0
+
+let strip_vector_brackets value =
+  let value = String.trim value in
+  let len = String.length value in
+  if len >= 2 && value.[0] = '[' && value.[len - 1] = ']' then
+    String.sub value 1 (len - 2)
+  else value
+
+let parse_id_string s =
+  try
+    let split_ids value =
+      Vec.split_on_char ',' value
+      |> Vec.concat_map (fun part ->
+          Vec.split_on_char ' ' part
+          |> Vec.concat_map (fun part -> Vec.split_on_char '\t' part))
+    in
+    let ids =
+      strip_vector_brackets s |> split_ids
+      |> Vec.filter_map (fun p ->
+          let p = String.trim p in
+          if p = "" then None else Some (Int64.of_string p))
+    in
+    if Vec.for_all valid_id ids then Ok { ids; multi = Vec.length ids > 1 }
+    else Error (Error.invalid_options "invalid id")
+  with _ -> Error (Error.invalid_options "invalid id")
+
+let to_single parsed =
+  if Vec.length parsed.ids = 1 then Vec.nth_opt parsed.ids 0 else None