Harness spec 3.3.0: name its spec commit (02c7282) in the README and CHANGELOG

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to LLeMbas CLI. The format follows
 [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and the project uses
 [Semantic Versioning](https://semver.org/).
 
+## [Unreleased]
+
+Harness spec 3.3.0 (spec commit 02c7282): subagents.
+
 ## [2.0.0-beta.3] — 2026-11-09
 
 Harness spec 3.2.0: teams, effort levels that mean what they say, the model's reasoning sent