chore(release): prepare 0.7.0 contract fixes (#22)

Author: moonyue-w

CHANGELOG.md

@@ -5,6 +5,8 @@ existing `0.1.0` release; earlier development prereleases are not listed.
 
 ## [Unreleased]
 
+## [0.7.0]
+
 ### Fixed
 
 - Align Managed Session budgets with the official decimal-string `max_credit_cost` contract, shared by Deployment budgets. The limit covers cumulative model and sandbox Credits; reaching it rejects the next user message without interrupting the current turn.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "qca-sdk"
-version = "0.6.0"
+version = "0.7.0"
 description = "Typed synchronous and asynchronous clients for Qoder Cloud Agents"
 authors = [{name = "Qoder"}]
 license = "MIT"