feat(automations): duplicate endpoint

[gabrielmfern]

Adds automations->duplicate($automationId) for POST /automations/{id}/duplicate.

Resolves DEV-1705. Mirrors the existing stop pattern and resend-node resend/resend-node#1071.

🤖 Generated with Claude Code

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Summary by cubic

Adds Automations duplicate support to the PHP SDK so clients can clone an existing automation. Previously there was no SDK method; now automations->duplicate($automationId) issues POST /automations/{id}/duplicate and returns the new Automation. Supports DEV-1705.

Details

• Implements duplicate(string $automationId) in the Automations service, mirroring the existing stop pattern (no request body).
• Adds a test for the POST path and Automation resource parsing.
• No breaking changes; consumers can start calling duplicate where needed.

^{Written for commit 65987a3. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Auto-approved: Adds a new SDK method duplicate with a focused test, mirroring the existing stop pattern; no changes to existing behavior, contracts, or configuration.

Re-trigger cubic</sub>

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