Remove broken common submodule pre-build workaround

[Copilot]

The previous change assumed the firmware could recover missing shared headers by initializing a common/ git submodule during the PlatformIO pre-build step. Based on follow-up feedback, that submodule reference is not valid for this repository, so the workaround has been removed.

• Reverted build-script behavior

  • Removed the added common/ submodule initialization logic from scripts/gen_version.py.
  • Restored the pre-build script to its original version-generation-only behavior.

• Source reference investigation

  • Verified that the remaining compile issue is due to unresolved in-repository header/module references rather than a recoverable submodule checkout step.
  • Identified missing project-local references from src/, including:
    • conn_log.h
    • net_console.h
    • tc_hmi.h
    • tcc_pinmap.h
    • cmd_gpio.h
    • cmd_pwm.h
    • cmd_adc.h
    • cmd_i2c.h
    • cmd_wifi.h
    • cmd_ota.h
    • cmd_uart.h
    • cmd_swd.h
    • cmd_mqtt.h
    • cmd_statemachine.h
    • tc_statemachine.h
    • tc_mqtt.h

• Scope

  • No firmware logic changes.
  • No new dependency-handling behavior.
  • Focused on removing the invalid submodule workaround and documenting the actual missing source references now blocking compilation.

[!WARNING]

[adamj537]

The submodule linked to this project does not exist. Please remove the reference to the submodule, and instead try to find any missing function references between the source files.

[Copilot]

The submodule linked to this project does not exist. Please remove the reference to the submodule, and instead try to find any missing function references between the source files.

Removed the submodule-based prebuild logic in e42b7c4. I also checked the repo for in-tree missing references and the unresolved project-local modules I could confirm are conn_log.h/conn_log_init/register_conn_log_commands, net_console.h/net_console_start, tc_hmi.h/tc_hmi_init/tc_hmi_start, tcc_pinmap.h, plus the absent command/state-machine headers referenced from src/ such as cmd_gpio.h, cmd_pwm.h, cmd_adc.h, cmd_i2c.h, cmd_wifi.h, cmd_ota.h, cmd_uart.h, cmd_swd.h, cmd_mqtt.h, cmd_statemachine.h, tc_statemachine.h, and tc_mqtt.h.