Add Unit SDK docs sync automation prompt

[avesk]

Summary

Adds .cursor/prompts/unit-sdk-docs-sync-automation.md: the tightened automation prompt from the audit (audit_sdk_sync_automation plan).

This gives recurring docs-sync automation:

• Prerequisites (sdk-guide + python-sdk rule), idempotency (gh pr list), upstream git log snippet for PR body
• Accurate DTO guidance (@staticmethod from_json_api, self.attributes camelCase vs snake_case kwargs, codecs vs nested sub-objects only)
• Additive-only policy with a Manual review needed section for renames/removals/type flips
• Cap of 5 resources per run; one PR per automated run with one commit per resource; draft PR + Mirror notes
• Import verification (DtoDecoder / mappings)

Note

Graphite gt submit failed here with the repo not in Graphite synced repos (Edit your synced repos at https://app.graphite.com/settings/synced-repos). Import this repository there, then stacks/PR workflows from Graphite apply. The PR was opened via gh pr create.

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