ai: add CLAUDE.md for AI agent context

CLAUDE.md

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+# CLAUDE.md
+
+This is `blackroad-os-api` — part of BlackRoad OS.
+
+> BlackRoad OS — os api
+
+## Owner
+BlackRoad OS, Inc. — Proprietary. All rights reserved.
+
+## AI Instructions
+- Part of BlackRoad ecosystem (615+ repos, 15 orgs)
+- Primary git: RoadCode (Gitea). GitHub is mirror.
+- All code proprietary unless marked otherwise
+- Brand: black bg, white text, gradient accents
+- Fonts: Space Grotesk, Inter, JetBrains Mono
+- Language: Python
+
+## Memory System
+- Check codex: `memory-codex.sh search "<problem>"`
+- Log actions: `memory-system.sh log <action> <entity> "<details>"`
+- Broadcast: `memory-til-broadcast.sh broadcast <cat> "<learning>"`
+
+## Collaboration
+- Register: `memory-collaboration.sh register`
+- Claim: `memory-collaboration.sh claim "<task>"`
+- Board: `memory-collaboration.sh board`