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

projects/org-eval-tool/README.org

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+#+TITLE: org-eval
+
+Evaluate Lisp source blocks in an .org file via Emacs batch mode.
+
+== Usage
+
+#+begin_src shell
+  org-eval org/file.org          # evaluate all blocks
+  org-eval org/file.org 3        # evaluate block at index 3 (0-based)
+#+end_src
+
+Useful for quick REPL evaluation without starting the daemon — Emacs
+tangles and evaluates the block inline. Results are printed to stdout.
+
+== Dependencies
+
+Emacs with org-mode (org-babel).