Align OpenZero catalog with verified Ministral runtime

[ResearchForumOnline]

Summary

• make the verified Ministral 8B Runtime Agent Q5_K_M the sole promoted OpenZero and Tab Pilot default
• retain Gemma E4B as an explicit compatibility fallback and remove Qwen/Fusion promotion
• expose active/recommended model metadata through the local API
• publish a checksum-pinned installer contract and regression test
• align Super Agent, extension, public pages, offline docs, and migration guidance

Evidence

• OpenZero unittest suite: 76/76
• skills checks: 27/27
• Tab Pilot tests: 21/21
• Python compile and manifest/security checks: pass
• installer: 17,212 bytes; SHA-256 aadd7aabf7ca8b28bc46d6365f007a7221f7d648bb9e5ddeda664d0f48ed7acc
• git diff --check: clean

No model weights are changed. Gemma remains available for compatibility.