chore(awn-cli): release v1.7.0 (#173)

## Summary

Bump AWN CLI version to 1.7.0 for release.

## Changes in v1.7.0

- **New feature**: `awn action` command for calling world actions
  ```bash
  awn action <world_id> <action_name> [params_json]
  awn action pixel-city set_state '{"state":"idle","detail":"Hello"}'
  awn action pixel-city heartbeat
  awn action pixel-city post_memo '{"content":"My memo"}'
  ```

## Test plan

- [x] Code compiles
- [x] Tested against live world server
- [x] Actions work correctly (set_state, heartbeat, post_memo)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: Jing-yilin

packages/awn-cli/Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "awn"
-version = "1.6.0"
+version = "1.7.0"
 edition = "2021"
 description = "Agent World Network CLI — standalone agent-native interface for world-scoped P2P messaging"
 license = "MIT"