[codex] Add MC0 companion event revisions

[n30nex]

Summary

• Adds MC0 companion snapshot revisions and event sequence state for MeshCore companion clients.
• Extends MC0 USB handling with EVENTS, since filtering, typed event drain, and queued TX status events.
• Expands native/sim and COM8 hardware smoke coverage for HELLO/STATUS/NODES/THREADS/EVENTS behavior.
• Fixes Windows artifact smoke tooling for esptool v4 underscore command names and UTF-8 serial console output.

Validation

• python -m py_compile scripts\serial_harness.py scripts\tdeck_smoke.py scripts\mc_companion_usb_smoke.py scripts\fetch_tdeck_artifact.py scripts\release_evidence.py
• git diff --check
• pio run -e native
• .pio\build\native\program.exe --selftest
• .pio\build\native\program.exe --simtest
• GitHub Actions Firmware CI: https://github.com/ItsLimitlezz/LimitlezzOS/actions/runs/27871889642

Hardware Evidence

• Target: COM8 only, ESP32-S3 VID_303A/PID_1001, MAC cc:8d:a2:0d:14:28.
• Artifact: tdeck-meshcore-firmware-07a609686296e02edbf6869dc446fb39483ffe91 from run 27871889642.
• Manifest: env=tdeck-meshcore, meshcore_enabled=1, budget_status=pass, firmware_bytes=1580704, static_ram_bytes=231684.
• Flash: scripts\tdeck_smoke.py --port COM8 --no-stub-upload --skip-build --artifact-dir .pio\ci-artifacts\tdeck-meshcore ... completed with all hashes verified.
• Serial smoke: id, sys, net, rf, stats, wifi, dm status, nodes, companion test, companion ble completed with smoke PASS.
• MC0 USB smoke: scripts\mc_companion_usb_smoke.py --port COM8 --mc0-usb --open-timeout 60 --boot-timeout 90 --timeout 30 completed with smoke PASS.

Notes

• The flashed settings currently report networks: Meshtastic on, MeshCore off; the binary is the MeshCore-enabled TDM artifact and MC0 identity/status paths report MeshCore enabled for companion mode.