feat: Add Uptime Kuma auto-update

Docker compose update via SSH to abraham.jeena.net. Review examples
include real v2.x patches as auto and the v1→v2 migration as manual,
plus a synthetic v2→v3 breaking change example.

Also fix test_classifier.py version derivation for x.0.0 releases
where patch decrement would produce the same version, causing the
model to see a nonsensical "upgrading from 2.0.0 to 2.0.0" prompt.

test_classifier.py

@@ -29,12 +29,20 @@ def guess_version_from_notes(notes: str) -> str:
 
 
 def make_previous_version(version: str) -> str:
-    """Decrement patch to simulate upgrading from the previous patch release."""
+    """Decrement version to simulate upgrading from a previous release."""
     parts = version.split(".")
     if len(parts) == 3 and parts[2].isdigit():
         patch = int(parts[2])
         if patch > 0:
             return f"{parts[0]}.{parts[1]}.{patch - 1}"
+        # x.y.0 → decrement minor
+        minor = int(parts[1])
+        if minor > 0:
+            return f"{parts[0]}.{minor - 1}.0"
+        # x.0.0 → decrement major
+        major = int(parts[0])
+        if major > 0:
+            return f"{major - 1}.0.0"
     return version