docs(docs): add concept profiles, arsenal history, and core architecture structure

[01rabbit]

Summary

• add a new documentation layer split into concept profiles, accepted/public Arsenal history, and stable core architecture
• create docs/concepts/, docs/arsenal/, and docs/architecture/ without deleting existing docs
• add concise navigation links from README and docs index to the new structure

Files Added

• docs/concepts/offline-edge-ai-socnoc.md
• docs/concepts/deterministic-edge-decision-support.md
• docs/concepts/auditable-edge-socnoc.md
• docs/concepts/field-deployable-scapegoat-gateway.md
• docs/concepts/evolution-map.md
• docs/arsenal/README.md
• docs/arsenal/blackhat-asia-2026.md
• docs/arsenal/blackhat-usa-2026.md
• docs/architecture/decision-loop.md
• docs/architecture/deception-routing.md
• docs/architecture/local-ai-triage.md
• docs/architecture/evidence-model.md

Files Updated

• README.md
• docs/INDEX.md

Notes

• preserves existing documents (no removals)
• avoids future unaccepted event pages and keeps those ideas under concept profiles
• uses conservative capability status labels (Implemented/Planned/Prototype/Conceptual)