Add reviewed task-file flow for Codex sleep runs

[Kirchberg]

Summary

PR adds a safer Codex-oriented SkillOpt-Sleep workflow for optimizing repo-scoped skills

• Adds a reviewed task-file flow so Codex-backed runs can replay explicitly reviewed tasks instead of mining raw archived sessions at run time
• Adds --target-skill-path support to focus harvesting, mining, staging, and adoption on a specific repo skill.
• Runs Codex CLI backend calls from the target project directory using codex exec -C <project> and cwd=<project>
• Adds bounded-run controls and diagnostics, including --max-sessions, --max-tasks, --progress, rejected edit reporting, and no-edits reasons
• Documents the Codex reviewed-task workflow for bounded and privacy-sensitive runs

Testing

• git diff --check
• python3 -m unittest tests.test_sleep_engine -v

[Kirchberg]

The main change is moving from “mine raw archives and run immediately” to a reviewed task-file flow: export candidate tasks, inspect/redact them, mark them as reviewed, and only then run the real backend. It also lets users target a specific repo skill with --target-skill-path, runs Codex from the correct project directory, and adds bounded-run/progress diagnostics so runs are easier to control and debug

In practice, this turns SkillOpt into a scoped proposal generator for Codex skills rather than an opaque run over the full session archive