docs: add v0.7.0 changelog

Author: btriapitsyn

CHANGELOG.md

@@ -1,11 +1,16 @@
 # Changelog
 
+## 0.7.0
+
+- Removed the Command Code CLI runtime dependency; OpenCode now owns browser OAuth credentials
+- Load the live model catalog directly from the public Command Code API
+- Use Laguna as the provider-local small model with dedicated `title-gen` requests
+- Preserve authoritative gateway billing cost in OpenCode session usage
+- Return proper upstream errors and map tool results to their originating tool calls
+
 ## 0.1.0
 
 - Initial release: Command Code OpenCode plugin
 - Local OpenAI-compatible proxy → `api.commandcode.ai/alpha/generate`
-- Auth via Command Code browser OAuth with OpenCode-owned credential persistence
-- Live model catalog from the public Command Code API; the Command Code CLI is no longer required
-- Provider-local Laguna small model and dedicated `title-gen` requests for session titles
 - Default model: Laguna S 2.1 free (`poolside/laguna-s-2.1-free`)
 - Tools/MCP park-resume, attachment plumbing, context compact, usage endpoints