feat: Vestige v2.0.0 "Cognitive Leap" — 3D dashboard, HyDE search, WebSocket events

The biggest release in Vestige history. Complete visual and cognitive overhaul.

Dashboard:
- SvelteKit 2 + Three.js 3D neural visualization at localhost:3927/dashboard
- 7 interactive pages: Graph, Memories, Timeline, Feed, Explore, Intentions, Stats
- WebSocket event bus with 16 event types, real-time 3D animations
- Bloom post-processing, GPU instanced rendering, force-directed layout
- Dream visualization mode, FSRS retention curves, command palette (Cmd+K)
- Keyboard shortcuts, responsive mobile layout, PWA installable
- Single binary deployment via include_dir! (22MB)

Engine:
- HyDE query expansion (intent classification + 3-5 semantic variants + centroid)
- fastembed 5.11 with optional Nomic v2 MoE + Qwen3 reranker + Metal GPU
- Emotional memory module (#29)
- Criterion benchmark suite

Backend:
- Axum WebSocket at /ws with heartbeat + event broadcast
- 7 new REST endpoints for cognitive operations
- Event emission from MCP tools via shared broadcast channel
- CORS for SvelteKit dev mode

Distribution:
- GitHub issue templates (bug report, feature request)
- CHANGELOG with comprehensive v2.0 release notes
- README updated with dashboard docs, architecture diagram, comparison table

734 tests passing, zero warnings, 22MB release binary.

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

crates/vestige-mcp/Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "vestige-mcp"
-version = "1.9.1"
+version = "2.0.0"
 edition = "2024"
-description = "Cognitive memory MCP server for Claude - FSRS-6, spreading activation, synaptic tagging, and 130 years of memory research"
+description = "Cognitive memory MCP server for Claude - FSRS-6, spreading activation, synaptic tagging, 3D dashboard, and 130 years of memory research"
 authors = ["samvallad33"]
 license = "AGPL-3.0-only"
 keywords = ["mcp", "ai", "memory", "fsrs", "neuroscience", "cognitive-science", "spaced-repetition"]
@@ -32,7 +32,7 @@ path = "src/bin/cli.rs"
 # ============================================================================
 # Includes: FSRS-6, spreading activation, synaptic tagging, hippocampal indexing,
 # memory states, context memory, importance signals, dreams, and more
-vestige-core = { version = "1.0.0", path = "../vestige-core" }
+vestige-core = { version = "2.0.0", path = "../vestige-core" }
 
 # ============================================================================
 # MCP Server Dependencies
@@ -72,10 +72,15 @@ colored = "3"
 rusqlite = { version = "0.38", features = ["bundled"] }
 
 # Dashboard (v1.2) - hyper/tower already in Cargo.lock via rmcp/reqwest
-axum = { version = "0.8", default-features = false, features = ["json", "query", "tokio", "http1"] }
+axum = { version = "0.8", default-features = false, features = ["json", "query", "tokio", "http1", "ws"] }
 tower = { version = "0.5", features = ["limit"] }
 tower-http = { version = "0.6", features = ["cors", "set-header"] }
+futures-util = "0.3"
 open = "5"
 
+# Embedded SvelteKit dashboard (v2.0)
+include_dir = "0.7"
+mime_guess = "2"
+
 [dev-dependencies]
 tempfile = "3"