ghostty: add terminal configuration

[mandaiy]

Summary

• add a Ghostty configuration with font, cursor, and macOS window settings
• install the Ghostty configuration through the bootstrap script
• enable Kitty graphics support in herdr and add the Ghostty reference link

Validation

• git diff --check
• python3 -m py_compile init
• pre-commit hooks run by git commit

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Use Ghostty's recognized config filename

When Ghostty uses its default config discovery, it reads $XDG_CONFIG_HOME/ghostty/config, but SymlinkToConfig preserves the source basename and therefore installs this as $XDG_CONFIG_HOME/ghostty/config.ghostty. The bootstrap succeeds while Ghostty silently ignores every setting added here; rename the repository file to ghostty/config or use an explicit destination ending in /ghostty/config.

AGENTS.md reference: AGENTS.md:L18-L19

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