Swift client: `createTerminal` / `disposeTerminal` have generated params but no AHPCommands builder

[colbylwilliams]

Summary

The terminal channel is fully modeled for inbound state (a terminalReducer plus all terminal/* actions) and the outbound command params are generated — but there is no typed builder to actually send the two client→server terminal commands, unlike the sibling session commands.

What exists today

• Protocol: createTerminal and disposeTerminal, both @direction Client → Server.
• Swift (module AgentHostProtocol): CreateTerminalParams and DisposeTerminalParams are generated; terminalReducer(state:action:) and the full set of terminal/* StateActions (terminal/data, terminal/exited, terminal/claimed, terminal/resized, …) exist and work.

The gap

• AHPCommands has builders for createSession and disposeSession, but none for createTerminal / disposeTerminal.
• AHPClient has no typed method for them either.
• So the terminal channel can be fully consumed (inbound, via the reducer) but cannot be driven (outbound, create/dispose) without client.request(method: "createTerminal", params: …) using a raw method string.

Proposed enhancement

Add AHPCommands.createTerminal / AHPCommands.disposeTerminal builders (and/or AHPClient methods) for parity with createSession / disposeSession, so the generated CreateTerminalParams / DisposeTerminalParams are reachable through the typed surface.

Version

Observed at protocol version 0.5.2 (latest release) and current main.