chore: initialize overstory and ecosystem tools

.overstory/README.md

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+# .overstory/
+
+This directory is managed by [overstory](https://github.com/jayminwest/overstory) — a multi-agent orchestration system for Claude Code.
+
+Overstory turns a single Claude Code session into a multi-agent team by spawning worker agents in git worktrees via tmux, coordinating them through a custom SQLite mail system, and merging their work back with tiered conflict resolution.
+
+## Key Commands
+
+- `ov init`          — Initialize this directory
+- `ov status`        — Show active agents and state
+- `ov sling <id>`    — Spawn a worker agent
+- `ov mail check`    — Check agent messages
+- `ov merge`         — Merge agent work back
+- `ov dashboard`     — Live TUI monitoring
+- `ov doctor`        — Run health checks
+
+## Structure
+
+- `config.yaml`             — Project configuration
+- `agent-manifest.json`     — Agent registry
+- `hooks.json`              — Claude Code hooks config
+- `agent-defs/`             — Agent definition files (.md)
+- `specs/`                  — Task specifications
+- `agents/`                 — Per-agent state and identity
+- `worktrees/`              — Git worktrees (gitignored)
+- `logs/`                   — Agent logs (gitignored)