docs: add issue report for missing reme envs

Author: arjuntheprogrammer

docs/issues/reme-launch-missing-env.md

@@ -0,0 +1,37 @@
+# Launcher crashes when `REME_PATH`/`REME_SCRIPT` are unset
+
+## Description
+Running `python launcher.py --conf examples/overall.yaml --with-appworld --with-reme` fails when ReMe-specific environment variables are not defined. `load_dotenv` only populates values that exist in a `.env` file, so in a fresh clone the required `REME_PATH` and `REME_SCRIPT` entries remain `None`. The launcher passes these values straight into `LaunchCommandWhenAbsent`, which attempts to hash them and crashes before ReMe is started.
+
+## Steps to Reproduce
+1. Clone `modelscope/AgentEvolver` (commit `2d7c14a2`).
+2. Ensure no `.env` file provides ReMe variables (default state).
+3. `conda activate agentevolver`.
+4. Run `python launcher.py --conf examples/overall.yaml --with-appworld --with-reme`.
+
+## Expected Result
+Launcher either starts ReMe or reports that the ReMe service configuration is missing in a user-friendly way.
+
+## Actual Result
+Launcher aborts with a `TypeError` while computing the companion process hash because `service_script` is `None`:
+
+```
+Traceback (most recent call last):
+  File "launcher.py", line 396, in <module>
+    main()
+  File "launcher.py", line 328, in main
+    pty_launch("reme", success_std_string="Uvicorn running on")
+  File "launcher.py", line 104, in pty_launch
+    companion = LaunchCommandWhenAbsent(
+  File "agentevolver/utils/daemon.py", line 276, in __init__
+    self.script_hash = hashlib.md5(''.join(hash_items).encode()).hexdigest()[:8]
+TypeError: sequence item 0: expected str instance, NoneType found
+```
+
+## Environment
+- OS: Ubuntu 22.04.5 LTS
+- Python: `conda` env `agentevolver`
+- Commit: `2d7c14a2`
+
+## Suggested Fix
+Validate that `REME_PATH` and `REME_SCRIPT` are set before invoking `LaunchCommandWhenAbsent`, and emit a clear error (or provide defaults) instead of proceeding with `None` values.