Add kanata keyboard remapper with parity to kmonad configuration

[Copilot]

Adds kanata as an alternative to kmonad for Linux keyboard remapping, replicating the existing Leap Code layout features.

Configuration Files

• kanata/profiles/: Two keyboard profiles (generic-laptop, ms-ergo) with:
  • Right Alt → layer toggle for leapmode
  • CapsLock → tap: Escape (<200ms), hold: Control
  • Leapmode layer: coding symbols (left hand) + navigation (right hand)

Syntax Migration

Kanata requires explicit shifted key notation unlike kmonad's escape sequences:

;; kmonad
\(   \)   $    {    }    \_   >

;; kanata  
@lprn @rprn @dlr @lcbr @rcbr @unds @grtr

;; where aliases defined as:
(defalias
  lprn S-9    ;; (
  rprn S-0    ;; )
  dlr  S-4    ;; $
  lcbr S-[    ;; {
  rcbr S-]    ;; }
  unds S--    ;; _
  grtr S-.    ;; >
)

Installation Scripts

• download.sh: Fetches kanata v1.10.0 with SHA256 verification
• install.sh: Systemd service setup, uses $SUDO_USER for correct group membership
• uninstall.sh: Clean removal
• kanata.service: Systemd unit with Nice=-20 priority
• kanata.rules: udev permissions for uinput device

Main README updated to list kanata first among Linux options.

Original prompt

in addtion to the ./kmonad settings, add a ./kanata folder and replicate all the features from kmonad in kanata, installing the installation script. The goal is to have a simple way to install the kanata software as well as the configurations.

Key features in my existing kmonad:

• Hold Right Alt for activating second layers
• CapsLock is Escape, on tap, Ctrl on hold.

You must first, carefully study how kanata works from https://github.com/jtroo/kanata. It's syntax and features are similar to kmonad at (https://github.com/kmonad/kmonad) but not identical. Make sure you migrate all the feature s from kmonad to kanata correctly.

After the migration, update README.md to add kanata.

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