Update protocol, docs-discovery skill, and doc layering
- Switched AI AGENT CORE PROTOCOL to new `[LOADED_DOCS: N files (+K this turn: ...)]` prefix format in all primary instruction files; updated examples and enforcement details.
- Added `docs-discovery` skill for proactive .md doc loading before code search; documented usage and integration as a shared agent skill.
- Introduced `## Protocol History` section and `LLM_PROTOCOL_DECISIONS.md` decision log for cross-repo protocol change tracking.
- Expanded protocol-audit skill and `REPOS.md` to support 8 instruction files (primary/inherit split), new invariants, and known issues.
- Added/updated structured TODO and issues docs for serialization, logging, and SignalR binary protocol.
- Improved cross-references, doc layering, and clarified documentation-first coding workflow.
- Various minor doc clarifications and formatting for protocol consistency.
Loretta
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