feat(brain): expand to 48 categories + update reclassify prompt

Add 13 more categories:
- Robotics & Embodied: robotics, autonomous
- Data & Knowledge: natural_language, computer_vision, knowledge_representation, data_engineering
- Crypto & Privacy: cryptography, privacy
- Math & Physics: mathematics, physics
- Human & Social: education, ai_safety, open_source

Total: 48 categories (was 35). Updated reclassify prompt with full list.

Co-Authored-By: claude-flow <ruv@ruv.net>

crates/mcp-brain-server/src/routes.rs

@@ -6685,7 +6685,7 @@ r#"You are categorizing memories for the π Brain knowledge system.
 
 Available categories (output EXACTLY one of these values — no prefixes, no groups):
 
-sota, discovery, hypothesis, cross_domain, neural_architecture, compression, self_learning, reinforcement_learning, graph_intelligence, distributed_systems, edge_computing, hardware_acceleration, architecture, quantum, neuromorphic, bio_computing, cognitive_science, formal_methods, geopolitics, climate, biomedical, space, finance, security, performance, pattern, solution, convention, tooling, debug, meta_cognition, benchmark
+sota, discovery, hypothesis, cross_domain, neural_architecture, compression, self_learning, reinforcement_learning, graph_intelligence, distributed_systems, edge_computing, hardware_acceleration, architecture, quantum, neuromorphic, bio_computing, cognitive_science, formal_methods, geopolitics, climate, biomedical, space, finance, security, performance, robotics, autonomous, natural_language, computer_vision, knowledge_representation, data_engineering, cryptography, privacy, mathematics, physics, education, ai_safety, open_source, meta_cognition, benchmark, pattern, solution, convention, tooling, debug
 
 Rules:
 - Output ONLY the category value (e.g. "biomedical" not "applied: biomedical")

crates/mcp-brain-server/src/types.rs

@@ -93,6 +93,42 @@ pub enum BrainCategory {
     /// Finance, trading, risk modeling
     Finance,
 
+    // ── Robotics & Embodied AI ──
+    /// Robotics, manipulation, locomotion, sensor fusion
+    Robotics,
+    /// Autonomous vehicles, drones, navigation
+    Autonomous,
+
+    // ── Data & Knowledge ──
+    /// Natural language processing, LLMs, text generation
+    NaturalLanguage,
+    /// Computer vision, image recognition, video understanding
+    ComputerVision,
+    /// Knowledge graphs, ontologies, semantic web
+    KnowledgeRepresentation,
+    /// Data pipelines, ETL, streaming, real-time processing
+    DataEngineering,
+
+    // ── Cryptography & Privacy ──
+    /// Cryptography, zero-knowledge proofs, homomorphic encryption
+    Cryptography,
+    /// Privacy, differential privacy, federated learning
+    Privacy,
+
+    // ── Mathematics & Physics ──
+    /// Mathematics, optimization, numerical methods
+    Mathematics,
+    /// Physics, simulation, computational science
+    Physics,
+
+    // ── Human & Social ──
+    /// Education, pedagogy, learning science
+    Education,
+    /// Ethics, AI safety, alignment
+    AiSafety,
+    /// Open source, community, collaboration
+    OpenSource,
+
     // ── Meta ──
     /// Knowledge about knowledge — epistemology, meta-learning
     MetaCognition,
@@ -135,6 +171,19 @@ impl std::fmt::Display for BrainCategory {
             Self::Biomedical => write!(f, "biomedical"),
             Self::Space => write!(f, "space"),
             Self::Finance => write!(f, "finance"),
+            Self::Robotics => write!(f, "robotics"),
+            Self::Autonomous => write!(f, "autonomous"),
+            Self::NaturalLanguage => write!(f, "natural_language"),
+            Self::ComputerVision => write!(f, "computer_vision"),
+            Self::KnowledgeRepresentation => write!(f, "knowledge_representation"),
+            Self::DataEngineering => write!(f, "data_engineering"),
+            Self::Cryptography => write!(f, "cryptography"),
+            Self::Privacy => write!(f, "privacy"),
+            Self::Mathematics => write!(f, "mathematics"),
+            Self::Physics => write!(f, "physics"),
+            Self::Education => write!(f, "education"),
+            Self::AiSafety => write!(f, "ai_safety"),
+            Self::OpenSource => write!(f, "open_source"),
             Self::MetaCognition => write!(f, "meta_cognition"),
             Self::Benchmark => write!(f, "benchmark"),
             Self::Custom(s) => write!(f, "{s}"),