ausimian / tricep / b744500cb0290617a8e992cc76dbb639cdd15ff2

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Add shutdown/2 function for half-close support

Implements BSD socket shutdown semantics:
- :write - sends FIN, disables sends
- :read - disables receives locally
- :read_write - both (equivalent to close)

Changes:
- Add read_shutdown state field to track read half-close
- Add shutdown/2 dispatch and state handlers
- Modify recv to return {:error, :closed} when read is shutdown
- Add comprehensive tests for all shutdown scenarios

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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