chore(release): prepare 0.3.0 for stable API additions

Author: moonyue-w

CHANGELOG.md

@@ -5,6 +5,8 @@ existing `0.1.0` release; earlier development prereleases are not listed.
 
 ## [Unreleased]
 
+## [0.3.0]
+
 ### Added
 
 - Forward Vault Credential updates for secret rotation and metadata merge patches, with automatic retries disabled for write-only updates.

CONTRIBUTING.md

@@ -128,7 +128,7 @@ Before the first release, create the GitHub `release` Environment with required
 
    ```bash
    gh workflow run release.yml --ref main \
-     -f version=0.2.0 \
+     -f version=0.3.0 \
      -f commit_sha=<40-character-main-sha> \
      -f batch_id=<safe-audit-token>
    ```

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "qca-sdk"
-version = "0.2.0"
+version = "0.3.0"
 description = "Typed synchronous and asynchronous clients for Qoder Cloud Agents"
 authors = [{name = "Qoder"}]
 license = "MIT"