fix: unlike not supported — wallmood is idempotent SET, not toggle (v0.4.5)

Extensive FW_DEBUG=1 testing revealed:
- wallmood with moodType=STAR is an idempotent SET operation, not a toggle
- Tested: all moodType variations, moodStarShortcut param, 9 alternative
  endpoints — none could remove a like
- Service Worker in the web app prevents intercepting the real unlike payload
- like=False now returns a clear error; like=True continues to work correctly
- SPEC.md updated with full investigation notes and ruled-out approaches

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mcp-familywall"
-version = "0.4.4"
+version = "0.4.5"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"