Feat/control packet Implement control packet handling for mesh node discovery

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Implement control packet handling for mesh node discovery

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Pull request overview

This PR implements control packet handling for mesh node discovery, adding a new packet type (0x0B CONTROL) and handler infrastructure to enable nodes to discover each other on the mesh network via zero-hop broadcast packets.

Key Changes:

• Added PAYLOAD_TYPE_CONTROL (0x0B) constant and corresponding packet type mapping
• Implemented ControlHandler for processing discovery request and response packets
• Added create_discovery_request() and create_discovery_response() methods to PacketBuilder
• Provided two example scripts demonstrating discovery functionality

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
src/pymc_core/protocol/constants.py	Added CONTROL (0x0B) and MULTIPART (0x0A) payload type constants
src/pymc_core/protocol/utils.py	Added string mappings for CONTROL and MULTIPART packet types
src/pymc_core/protocol/packet_builder.py	Implemented discovery request/response packet creation methods with proper encoding
src/pymc_core/node/handlers/control.py	New handler for processing control packets with callback-based discovery response collection
src/pymc_core/node/handlers/__init__.py	Exported ControlHandler for use by other modules
src/pymc_core/node/dispatcher.py	Registered ControlHandler as default handler for CONTROL packet type
examples/discover_nodes.py	Example demonstrating how to send discovery requests and collect responses
examples/respond_to_discovery.py	Example demonstrating how to listen for and respond to discovery requests

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