v0.5.0 — ADK-Rust 0.5.0 with 14 Providers & Resilience

⚡ Upgraded to ADK-Rust 0.5.0

New Providers (14 total)

Gemini, OpenAI, Anthropic, DeepSeek, Groq, Ollama, Fireworks, Together, Mistral, Perplexity, Cerebras, SambaNova, Amazon Bedrock, Azure AI

Tool Resilience

• Tool timeout (5 min) — prevents hung tool calls
• Retry budget (2 retries, 500ms delay) — auto-recovers transient failures
• Circuit breaker (threshold: 5) — disables tools after consecutive failures

Context Compaction

Loop agent uses LlmEventSummarizer to automatically summarize older events every 5 invocations, keeping context bounded during long implementation sessions.

Other Improvements

• Shared model factory (model_factory.rs) — eliminates 4× code duplication
• Per-agent temperature and max_output_tokens via LlmAgentBuilder
• DeepSeek auto-selects reasoner vs chat based on model name
• Anthropic auto-enables with_thinking() when configured
• GOOGLE_API_KEY as primary env var (with GEMINI_API_KEY fallback)
• OpenTelemetry upgraded to 0.31
• Typed UserId/SessionId, Content::new() builder pattern

Breaking Changes

• Minimum adk-rust version: 0.5.0
• SUPPORTED_PROVIDERS expanded from 4 to 14

See CHANGELOG.md for full details.