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chore: remove deprecated docker-compose version field

Remove deprecated 'version' field from docker-compose.dev.yml.
Docker Compose v2 ignores this field and it's no longer needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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docker-compose.dev.yml
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version: '3.8'
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# Coves Local Development Stack
# All-in-one setup: PDS + PostgreSQL + optional Relay
#