[XAP] implement "secure mode"

[tzarc]

XAP Task Info

Original Issue
Original spec document
Current XAP Definitions
Current XAP Generated Docs
Placeholder PR

Description

Any work in this area needs to be discussed with QMK Collaborators first.

XAP needs to support a "secure mode" for any critical pieces of functionality. Changes to keymaps or rebooting into bootloader cannot be made available unless an "unlock sequence" is initiated and performed first.

• Will need to be based on matrix positioning rather than keycodes
• Look at Vial for inspiration here
• Work out what needs to be intercepted and where
• Work out how to define the key sequence
  • Start from info.json, add support in the data-driven definitions, jsonschema etc.
  • Work out how to translate the defined key sequence into appropriate C code
• Need to handle some sort of inactivity timeout to get back to keyboard functionality
• Need to handle some sort of "escape" to get back to keyboard functionality
  • Will need to be based on matrix positioning rather than keycodes
• Need to add a broadcast message for secure mode entry, secure mode exit
• Need to add a route to query secure mode status
• Need to add a generic error if a secure-mode route is executed when not unlocked

[stale]

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[tzarc]

Confirmed working with XAP interactive shell on RP2040.