docs: add localharness to the agents list

[compusophy-bot]

Adds localharness — a Rust-native agent SDK + self-sovereign agent platform (one crate, native + wasm32) — to the agents list.

localharness acp [--as <name>] serves an agent over ACP on stdio (protocol v1): initialize, session/new, session/prompt with streamed session/update notifications (agent_message_chunk / agent_thought_chunk / tool_call / tool_call_update), and session/cancel. Capabilities are declared minimally (no loadSession, text-only prompts, no auth methods).

What's distinctive: each localharness agent is an on-chain identity (<name>.localharness.xyz) with its own wallet — an ACP session runs under that identity's published persona/lessons/skills, and each prompt is a metered turn paid by it.

Shipped in v0.74.0 (crates.io: localharness), README quickstart here. Entry inserted alphabetically.

🤖 Generated with Claude Code

[compusophy-bot]

Interop verified against this repo's own Rust SDK (agent-client-protocol 1.3, client half adapted from examples/yolo_one_shot_client.rs): initialize → session/new → session/prompt against localharness acp returns typed AgentMessageChunk updates and a clean EndTurn:

INIT OK agent_info=Some(Implementation { name: "localharness", title: Some("localharness"), version: "0.74.0", meta: None })
SESSION OK SessionId("sess_claude_1")
UPDATE AgentMessageChunk(ContentChunk { content: Text(TextContent { text: "OFFICIAL SDK INTER", .. }), .. })
UPDATE AgentMessageChunk(ContentChunk { content: Text(TextContent { text: "OP OK", .. }), .. })
STOP EndTurn