Tesla Shananigans

[dirwin31]

Pandad was reading and parsing CarParams at 10 Hz solely to determine Tesla pre-AP Always On Lateral engagement, including while offroad or indefinitely when CarParams was unavailable causing high cpu usage.

While investigating the original CPU error, I found that repeatedly parsing CarParams was unnecessary hot-loop work in relation to Feature Request - Pre-AP Support for Tesla in StarPilot (3621863)

This change:

• performs detection after each offroad-to-onroad transition
• waits for fingerprinting to populate CarParams
• latches the result for the remainder of the drive
• stops repeatedly reading and parsing CarParams
• avoids unnecessary work on bench or carless setups
• preserves the existing Always On Lateral behavior for Tesla pre-AP vehicles
• adds coverage for Always On Lateral transitions and invalid cruise states

Verification

• Refreshed the AGNOS-based sysroot and passed the laptop device-build doctor checks
• Confirmed the builder is Linux AArch64 with Cap’n Proto 1.0.2
• Successfully built selfdrive/pandad/pandad as a Linux ARM64 executable