docs(agents): rewrite AGENTS.md with detailed v0.2 execution plan
Replaces the original overview with a comprehensive execution plan for Owlen v0.2, including: - Provider health checks and resilient model listing for Ollama and Ollama Cloud - Cloud key‑gating, rate‑limit handling, and usage tracking - Multi‑provider model registry and UI aggregation - Session pipeline refactor for tool calls and partial updates - Robust streaming JSON parser - UI header displaying context usage percentages - Token usage tracker with hourly/weekly limits and toasts - New web.search tool wrapper and related commands - Expanded command set (`:provider`, `:model`, `:limits`, `:web`) and config sections - Additional documentation, testing guidelines, and release notes for v0.2.
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