docs: add README.org for repl, tangle, org-eval, verify-repl tools

projects/repl-tool/README.org

@@ -0,0 +1,27 @@
+#+TITLE: repl
+
+Send a Lisp form to the running Passepartout daemon REPL (port 9105).
+Prints the response from the daemon.
+
+== Usage
+
+#+begin_src shell
+  repl "(+ 1 2)"
+  echo "(+ 1 2)" | repl
+#+end_src
+
+== Environment
+
+- ~PASSEPARTOUT_HOST~ — daemon host (default 127.0.0.1)
+- ~PASSEPARTOUT_PORT~ — daemon port (default 9105)
+- ~PASSEPARTOUT_REPL_TIMEOUT~ — timeout seconds (default 10)
+
+== Protocol
+
+Connects via framed TCP (6-byte hex length prefix). Sends a
+~:repl-eval~ sensor event and reads the response. Expects the
+daemon to be running (~passepartout daemon~).
+
+== Dependencies
+
+Perl (stdlib only).