AgenticSupercharge v0.8.0 - Context efficiency and prompt caching

v0.8.0 - 2026-05-31

• Added prompt-cache-friendly guidance and docs/prompt-caching.md while keeping caching controlled by the host runtime/harness.
• Added AS-Workflow preferences.md for lightweight per-project do-not rules and durable user preferences, with init/doctor/test coverage.
• Strengthened global instructions for lean context, escalating ~60% / ~75% / ~85-90% context-budget heads-ups, native plan-mode versus clarify-and-plan, and native orchestration instead of custom orchestrators.
• Kept the catalog at 131 unique skills: v0.8 adds no new skills and keeps context skills router-selectable rather than always-on.
• Updated README examples, router/catalog guidance, attribution, and consistency checks for the context-efficiency release.