chore(release): v0.2.0

Highlights since v0.1.0:
- feat: SkillOpt-Sleep engine — nightly offline self-evolution
  (harvest -> mine -> replay -> consolidate behind a validation gate),
  with multi-objective reward, experience replay + dream rollouts,
  slow-update long-term memory, and secret redaction in cycle diagnostics.
  Shipped as the `skillopt-sleep` CLI.
- feat: cross-tool backends & plugin shells — Claude, Codex (+Desktop
  harvest), Copilot, Devin, and OpenClaw.
- feat: SearchQA split materialization + rollout fail-fast.
- fix: Windows robustness for claude/codex backends, hardened JSON
  fallback, Qwen timeout/thinking gating, Codex failure surfacing.

Packaging:
- Bump pyproject / skillopt / skillopt_sleep to 0.2.0.
- Restore skillopt_webui to the packaged wheel.

See CHANGELOG.md for the full changelog and contributor acknowledgements.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/sleep/README.md

@@ -28,6 +28,20 @@ experience → long-term competence).
 
 ## How to use it
 
+### Quickest path: the `skillopt-sleep` CLI (pip)
+
+```bash
+pip install skillopt        # installs the engine + the `skillopt-sleep` command
+skillopt-sleep dry-run      # harvest + mine + replay, report only (changes nothing)
+skillopt-sleep run          # a full nightly cycle; the proposal is staged for review
+skillopt-sleep status       # show state + the latest staged proposal
+skillopt-sleep adopt        # apply the latest staged proposal
+skillopt-sleep schedule     # install a nightly cron entry for this project
+```
+
+The per-agent plugin shells below (Claude Code / Codex / Copilot) still come from the
+repo; the CLI above is the standalone, pip-only way to run a cycle.
+
 One engine, thin per-agent shells (see [`plugins/`](../../plugins)):
 
 | Platform | Folder | Install |