fix: opencode compat tool call rendering and default to no-token

- Fix tool name lost on ToolResult events (persist via tool_name_by_call)
- Fix tool input lost on ToolResult events (persist via tool_args_by_call)
- Fix tool output in wrong field (error -> output)
- Fix text doubling in streaming (defer emit to ItemCompleted)
- Fix missing delta field in text streaming events
- Default server mode to no-token when --token not specified
- Add install-fast-sa and install-fast-gigacode justfile targets

justfile

@@ -48,6 +48,16 @@ check:
 fmt:
 	cargo fmt --all
 
+[group('dev')]
+install-fast-sa:
+	cargo build --release -p sandbox-agent
+	cp target/release/sandbox-agent ~/.cargo/bin/sandbox-agent
+
+[group('dev')]
+install-fast-gigacode:
+	cargo build --release -p gigacode
+	cp target/release/gigacode ~/.cargo/bin/gigacode
+
 [group('dev')]
 dev-docs:
 	cd docs && pnpm dlx mintlify dev