feat: acp http adapter

server/packages/acp-http-adapter/README.md

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+# acp-http-adapter
+
+Minimal ACP HTTP to stdio proxy.
+
+## Endpoints
+
+- `GET /v1/health`
+- `POST /v1/rpc`
+- `GET /v1/rpc` (SSE)
+- `DELETE /v1/rpc`
+
+## Stdio framing
+
+Uses ACP stdio framing from ACP docs:
+- UTF-8 JSON-RPC messages
+- one message per line
+- newline-delimited (`\n`)
+- no embedded newlines in messages
+
+## Run
+
+```bash
+cargo run -p acp-http-adapter -- \
+  --host 127.0.0.1 \
+  --port 7591 \
+  --registry-json '{"distribution":{"npx":{"package":"@zed-industries/codex-acp"}}}'
+```
+
+`--registry-json` accepts:
+- full registry document (`{"agents":[...]}`) with `--registry-agent-id`
+- single registry entry (`{"id":"...","distribution":...}`)
+- direct distribution object (`{"npx":...}` or `{"binary":...}`)
+
+## Library
+
+```rust
+use std::time::Duration;
+use acp_http_adapter::{run_server, ServerConfig};
+
+run_server(ServerConfig {
+    host: "127.0.0.1".to_string(),
+    port: 7591,
+    registry_json: r#"{"distribution":{"npx":{"package":"@zed-industries/codex-acp"}}}"#.to_string(),
+    registry_agent_id: None,
+    rpc_timeout: Duration::from_secs(120),
+}).await?;
+```