feat: launch the OpenNet ONP/1 cross-platform foundation

[devkyato]

Summary

Replaces the repository's former proxy-list content with the first honest, testable OpenNet foundation:

• specifies the versioned ONP/1 binary protocol;
• adds typed JSON/text/numeric/binary framing with CRC-32 and bounded payloads;
• adds an asyncio Python client/server for Raspberry Pi and backend systems;
• adds an ESP32 Arduino client and Arduino IDE/PlatformIO examples;
• adds contributor, security, architecture, compatibility, and release documentation;
• adds Python 3.9–3.14, ESP32 compile, package, and CodeQL workflows;
• builds installable Arduino ZIP and Python wheel/source packages.

Verification

• 16 Python protocol and live client/server integration tests pass.
• Ruff lint passes.
• Strict mypy checking passes.
• ESP32 Arduino example compiles with PlatformIO / Espressif32 7.0.1.
• Python sdist rebuilds its wheel successfully.
• Arduino release ZIP builds with matching 0.1.0 versions.
• GitHub-hosted CI passes on all supported Python versions.
• Physical ESP32 ↔ Raspberry Pi soak test (tracked separately; compatibility claims remain conservative until completed).

Review notes

The existing Proxies tag and original commits are preserved as repository history. This PR does not fabricate prior OpenNet releases or hardware results. Authors cannot approve their own PRs, so CI and an independent reviewer should be used before future compatibility claims are promoted.

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