docs: add director to ecosystem

[colinsurprenant]

Adds director to the plugins list.

Director is an Apache-2.0 coordination ledger for coding-agent work: sessions record decisions, open loops, and handoffs to an append-only log, and the current state is injected into every new session as ground truth. The OpenCode integration is a managed plugin: director install --opencode drops a self-contained plugin at ~/.config/opencode/plugin/director.js plus the /director-* custom commands, with no config files merged or modified. The same log is shared with its Claude Code and Codex integrations, so mixed-harness setups coordinate through one ledger.

Repo: https://github.com/colinsurprenant/director

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Pull request overview

This PR updates the website documentation to include the director project in the “Plugins” ecosystem list, making it discoverable alongside other OpenCode integrations.

Changes:

• Add a new ecosystem entry for director linking to https://github.com/colinsurprenant/director.
• Provide a short description of director’s purpose as a coordination ledger across multiple coding-agent harnesses.

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