refactor(mem0-plugin): improve hook scripts, config parsing, and skill definitions

Update git commit capture with better error handling, enhance user prompt hook,
extend config parser capabilities, and refine skill docs for dream, health,
mcp, pin, and stats skills.

mem0-plugin/skills/mem0-dream/SKILL.md

@@ -75,8 +75,8 @@ For each group, identify the following:
 Two memories are near-duplicates when they express the same fact or decision but
 phrased differently (e.g., "Use PostgreSQL for auth" and "Auth DB is PostgreSQL").
 
-Heuristics:
-- Significant noun/keyword overlap in the memory text.
+Heuristics — two memories are near-duplicates if **all** of these hold:
+- Similarity threshold: estimated cosine similarity > 0.9 (use noun/keyword overlap as proxy — if >60% of significant nouns overlap, treat as >0.9 similarity).
 - Same `metadata.type`.
 - Neither memory is pinned (`metadata.pinned != true`).