feat(claude): add Claude Code-specific configuration and skills directory

Author: tyeth

.claude/README.md

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+# `.claude/` — Claude Code-specific configuration
+
+Agent skills are canonical in `.agents/skills/` and shared across all harnesses (Claude Code, OpenCode, Cursor, etc.). This directory contains only Claude Code-specific configuration that cannot be made tool-agnostic.
+
+## Contents (Future use)
+
+- `agents/` — Sub-agent persona definitions with Claude Code-specific frontmatter (`model`, `memory`, `color`, `tools`).
+- `agent-memory/` — Persistent agent memory files. Claude Code runtime state, not portable across tools.

.claude/skills

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+../.agents/skills/