varlink / rust / 20877078150

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feat: add multi-reply support for async mode (more/continues flags)

The `more` flag in requests and `continues` flag in responses were not
working in async mode. This commit fixes the async code generation and
client to properly support multi-reply sequences.

Server-side changes (varlink_generator):
- AsyncCall now tracks `continues`, `more`, `oneway` flags and collects
  multiple replies in a Vec
- `wants_more()` returns the actual client request flag
- `is_oneway()` returns the actual client request flag
- `set_continues()` stores the value and applies it to replies
- `reply_struct()` validates consistency and sets `continues: Some(true)`
- Handler dispatch extracts request metadata and sends all replies

Client-side changes (varlink/client_async.rs):
- Added persistent `recv_buf` to AsyncMethodCall to handle multiple
  messages arriving in a single read (fixes buffering bug)
- Added `continues()` method to check if more replies are expected
- Rewrote `recv()` to properly parse messages from the buffer

Also adds `examples/async_more/` demonstrating multi-reply functionality.

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

Co-Authored-By: Claude <noreply@anthropic.com>

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