fix: use moodStarShortcut+moodMap for liked state, warn on silent fail (v0.4.6)

FW_DEBUG=1 investigation revealed:
- wallmood can silently fail (200 OK, frozen modifDate, no state change) due to
  self-like restriction, unsupported post type (FAMILY_CREATED), or rate limit
- Response contains two complementary like indicators: moodStarShortcut (primary)
  and moodMap (secondary) — both must be checked
- liked: false with like=True now surfaces a warning instead of silently
  returning a misleading result
- SPEC.md documents silent-fail scenarios and dual indicator pattern

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 = "0.4.5"
+version = "0.4.6"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"