v0.2.0 — Observability (Core), Antigravity CLI (agy) Transition, and Persona Vault Alignment

What's New in v0.2.0

🚀 Google AI Transition: Antigravity CLI (agy) Support

• Transitioning from Gemini CLI: In light of Google's official announcement (Transitioning from Gemini CLI to Antigravity CLI), NEXUS now treats Antigravity CLI (agy) as Google's primary AI developer runtime.
• Automated Stdio MCP Wiring: setup-nexus.sh and teardown-nexus.sh now automatically configure the nexus-ollama compute plane inside ~/.gemini/config/mcp_config.json, giving agy access to local model delegation tools (ollama_commit_msg, ollama_boilerplate, ollama_test_scaffold, ollama_lint_fix).
• Dual-Compatibility: Backward compatibility is retained for existing Gemini CLI users while optimizing forward-looking workflows for agy.

📊 Observability (Core Milestone)

• SQLite Metrics Schema: Complete database schema defined in docs/observability-schema.md for task routing and latency telemetry.
• Token & Savings Estimation: Automated task token logging and cloud API cost savings estimates via the nexus-ollama MCP server.
• TUI Analytics: Live route distribution metrics and p95 latency tracking directly in the Bubble Tea TUI dashboard.

🧪 Local Compute Telemetry & Benchmarks

• Empirical Benchmarks: Formalized throughput test suite (tools/utilities/benchmark-local.sh) and documented benchmarks (docs/tests/performance-benchmarks.md) on mobile RTX 3050 (4GB VRAM):
  • 0.5B: ~250 t/s
  • 1.5B: ~123 t/s
  • 3B: ~75 t/s
  • Parameter cliff identified at 4B+ due to VRAM spillover.

🎭 Persona Vault Alignment

• Roster Synchronization: Persona roster in personas/ synchronized with the new public vault canoo/Nexus-Personas.
• Onboarding Guide: Promoted onboarding-guide as the primary setup assistant in core/NEXUS.md and core/kiro-nexus-steering.md.
• Archival: Moved toolkiit-migrator to personas/_archive/ to keep public distribution clean.

🛠️ Toolchain & CI

• Updated Go toolchain to 1.26.3.
• Updated GitHub Actions CI environment to Node 22.