Add a new `split` command to the AppleScript scripting dictionary that
splits a terminal in a given direction (right, left, down, up) and
returns the newly created terminal.

The command is exposed as:
  split terminal <terminal> direction <direction>

Also adds a `fourCharCode` String extension for converting four-character
ASCII strings to their FourCharCode (UInt32) representation.

Add two new AppleScript commands to the scripting dictionary:

- `focus terminal <terminal>` — focuses the given terminal and brings
  its window to the front.
- `close terminal <terminal>` — closes the given terminal without a
  confirmation prompt.

Each command is implemented as an NSScriptCommand subclass following
the same pattern as the existing split command.

Add five new AppleScript commands to Ghostty.sdef mirroring the existing
App Intents for terminal input:

- `input text`: send text to a terminal as if pasted
- `send key`: simulate a keyboard event with optional action and modifiers
- `send mouse button`: send a mouse button press/release event
- `send mouse position`: send a mouse cursor position event
- `send mouse scroll`: send a scroll event with precision and momentum

A shared `input action` enumeration (press/release) is used by both key
and mouse button commands. Modifier keys are passed as a comma-separated
string parameter (shift, control, option, command).

Add standard Cocoa scripting definitions to the AppleScript dictionary:

- Application properties: name, frontmost, version
- Standard Suite commands: exists, quit

These are backed by built-in Cocoa scripting classes (NSExistsCommand,
NSQuitCommand) and standard NSApplication KVC keys, so no Swift code
changes are needed.

Add ScriptWindow and ScriptTab classes to expose window/tab hierarchy
to AppleScript, along with the corresponding sdef definitions.

The application class in Ghostty.sdef was missing a responds-to
declaration for the quit command. Apple's Cocoa Scripting requires
the application class to explicitly declare it responds to quit via
handleQuitScriptCommand: for the aevtquit event to be dispatched.

Expose terminal surfaces as elements on both ScriptWindow and ScriptTab,
allowing AppleScript to enumerate terminals scoped to a specific window
or tab (e.g. `terminals of window 1`, `terminals of tab 1 of window 1`).

Changes:
- Add `<element type="terminal">` to window and tab classes in Ghostty.sdef
- Add `terminals` computed property and `valueInTerminalsWithUniqueID:`
  lookup to ScriptWindow (returns all surfaces across all tabs)
- Add `terminals` computed property and `valueInTerminalsWithUniqueID:`
  lookup to ScriptTab (returns surfaces within that tab)

Add a `name` property (code `pnam`, cocoa key `title`) to the window, tab,
and terminal classes in the scripting definition. This follows the standard
Cocoa scripting convention where `name`/`pnam` maps to the `title` KVC key,
matching what Apple does in CocoaStandard.sdef for NSWindow.

Also fixes the pre-existing terminal `title` property which used a custom
four-char code (`Gttl`) that AppleScript could not resolve directly — only
via `properties of terminal`. All three classes now use the standard `pnam`
code so `name of window 1`, `name of tab 1 of window 1`, and
`name of terminal 1` all work correctly.

Add a `new window` command to the scripting dictionary and wire it to
`NSApplication` so AppleScript can create Ghostty windows.

The command returns a scripting `window` object for the created window,
with a fallback to a direct wrapper when AppKit window ordering has not
yet refreshed in the current run loop.

Add a `surface configuration` record type to the scripting dictionary,
implement `new surface configuration` (with optional copy-from), and allow
`new window` to accept `with configuration`.

Document the preferred Ghostty.sdef top-level order in AGENTS.md and reorder 
Ghostty Suite definitions to classes, records, enums, then commands.

Add scripting dictionary commands for activating windows, selecting tabs,
closing tabs, and closing windows.

Implement the corresponding Cocoa AppleScript command handlers and expose
minimal ScriptWindow/ScriptTab helpers needed to resolve live targets.

Verified by building Ghostty and running osascript commands against the
absolute Debug app path to exercise all four new commands.

Change split, focus, close, activate window, select tab, close tab, and
close window commands to accept their target object as a direct parameter
instead of a named parameter. This produces natural AppleScript syntax:

  activate window (window 1)
  close tab (tab 1 of window 1)
  split (terminal 1) direction right

instead of the awkward redundant form:

  activate window window (window 1)
  close tab tab (tab 1 of window 1)
  split terminal (terminal 1) direction right

The implementation moves command logic from NSScriptCommand subclasses
into responds-to handler methods on ScriptTerminal, ScriptWindow, and
ScriptTab, which is the standard Cocoa Scripting pattern for commands
whose direct parameter is an application class.