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>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,80 @@
+name: Bug Report
+description: Report a bug in Vestige
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill out the sections below.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear description of what the bug is.
+      placeholder: What happened? What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: How can we reproduce this?
+      placeholder: |
+        1. Run `vestige-mcp` with...
+        2. Call tool `search` with...
+        3. See error...
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Error output / logs
+      description: Paste any error messages or relevant log output.
+      render: shell
+
+  - type: dropdown
+    id: install
+    attributes:
+      label: Installation method
+      options:
+        - Pre-built binary (GitHub Releases)
+        - npm (vestige-mcp)
+        - Built from source (cargo build)
+    validations:
+      required: true
+
+  - type: dropdown
+    id: ide
+    attributes:
+      label: IDE / Client
+      options:
+        - Claude Code
+        - Claude Desktop
+        - Cursor
+        - VS Code (Copilot)
+        - Xcode
+        - JetBrains
+        - Windsurf
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      placeholder: "e.g. macOS 15.3 (Apple Silicon), Ubuntu 24.04, Windows 11"
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Vestige version
+      placeholder: "e.g. 2.0.0 (run `vestige --version`)"
+    validations:
+      required: true