fix pipeline: editable install; add CI badge to README

.woodpecker.yml

@@ -5,5 +5,5 @@ steps:
   test:
     image: python:3.11-slim
     commands:
-      - pip install --no-cache-dir . pytest
+      - pip install --no-cache-dir --editable . pytest
       - python -m pytest tests/ -v

README.md

@@ -1,6 +1,9 @@
 # Dervish MCP
 
-<p align="left"><img src="dervish-logo.png" alt="Dervish" width="180"></p>
+<p align="left">
+  <img src="dervish-logo.png" alt="Dervish" width="180">
+  <img src="https://ci.corentic.eu/api/badges/7/status.svg" alt="CI Pipeline Status">
+</p>
 
 **Dervish** infers **regular expression grammars** from example sequences using the BEX family of algorithms. Given a set of example sequences (strings over some alphabet), it learns a compact regular expression that captures the general pattern.