ci: run unit tests on every push

Move per-step `when` filters: unit tests now run on every branch push,
integration tests keep pull_request + main/dev branch restriction.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.woodpecker/check.yml

@@ -1,3 +1,17 @@
+steps:
+  unit-tests:
+    image: ghcr.io/astral-sh/uv:python3.13-bookworm
+    when:
+      event: push
+      path:
+        - "src/**"
+        - "tests/**"
+    commands:
+      - uv sync --dev
+      - uv run pytest -m "not integration" -v
+
+  integration-tests:
+    image: ghcr.io/astral-sh/uv:python3.13-bookworm
     when:
       event: pull_request
       branch:
@@ -6,16 +20,6 @@ when:
       path:
         - "src/**"
         - "tests/**"
-
-steps:
-  unit-tests:
-    image: ghcr.io/astral-sh/uv:python3.13-bookworm
-    commands:
-      - uv sync --dev
-      - uv run pytest -m "not integration" -v
-
-  integration-tests:
-    image: ghcr.io/astral-sh/uv:python3.13-bookworm
     environment:
       WRENN_API_KEY:
         from_secret: WRENN_API_KEY