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/platform/cli_unix.mli

@@ -0,0 +1,53 @@
+type error = EAGAIN | EWOULDBLOCK | ETIMEDOUT | ESRCH | EPERM
+type access_permission = R_OK | W_OK
+type open_flag = O_RDWR
+type file_descr = int
+type stats = { st_size : int; st_mtime : float }
+type process_result = { status : int; stdout : string; stderr : string }
+type mkdir_result = Created | Already_exists
+
+exception Cli_unix_error of error * string * string
+
+val mkdir : string -> int -> unit
+val rmdir : string -> unit
+val mkdir_exclusive : string -> int -> mkdir_result
+val file_exists : string -> bool
+val is_directory : string -> bool
+val readdir : string -> string array
+val mkdir_p : string -> unit
+val write_text_file : string -> string -> unit
+val read_text_file : string -> string
+val read_stdin_all : unit -> string
+val write_binary_file : string -> string -> unit
+val read_binary_file : string -> string
+val copy_file : string -> string -> unit
+val remove_tree : string -> unit
+val rename : string -> string -> unit
+val getpid : unit -> int
+val process_running : int -> bool
+val chmod : string -> int -> unit
+val access : string -> access_permission Rrbvec.t -> unit
+val stat : string -> stats
+val environment : unit -> string array
+val gethostname : unit -> string
+val openfile : string -> open_flag Rrbvec.t -> int -> file_descr
+val close : file_descr -> unit
+
+val create_process_env :
+  string ->
+  string array ->
+  string array ->
+  file_descr ->
+  file_descr ->
+  file_descr ->
+  int
+
+val run_process_capture :
+  string -> string Rrbvec.t -> string array -> process_result
+
+val start_process_capture_session_line :
+  string -> string Rrbvec.t -> string array -> process_result
+
+val kill : int -> int -> unit
+val open_url : string -> bool
+val write_stdout : string -> unit