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Adds an always-available `/compact` slash command to Zed's native agent
that forces a summary-based context compaction of the current
conversation, regardless of token usage. This reuses the agent's
existing compaction logic (always the summary strategy, never
provider-native), bypassing the automatic-compaction token threshold and
minimum-context-window guard since the user explicitly asked to compact.
The command lives entirely in `NativeAgent`/`NativeAgentConnection`, so
external (ACP) agents are untouched and keep their own `/compact`
implementations.

The command is gated behind the `handoff` feature flag, matching the
gate on automatic compaction, so it's only advertised and dispatched
when that flag is enabled. When the flag is off, typing `/compact` is
treated as an ordinary prompt.

Because the agent panel always renders the typed `/compact` as a user
message, the manual compaction records a matching zero-content user
message in the model thread (skipped when building model requests) so
that rewinding/truncating that message works instead of erroring, while
keeping the command itself out of the model's context.

The slash-command popup now groups commands into separate sections by
source — "Commands" (built-in, e.g. `/compact`), "MCP Server Commands",
and "ACP Agent Commands" — so same-named commands from different sources
show up as distinguishable duplicates. The source category travels on
each command's ACP `_meta`.

Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>