chore: bump version to 0.3.16

[anaselmhamdi]

Summary

• Bumps version 0.3.15 → 0.3.16
• Moves the [Unreleased] changelog entry to the new [0.3.16] - 2026-04-20 section
• Releases the cursor-resume fix from fix: parse cursor pagination with json.loads on resume #76 (json.loads instead of ast.literal_eval when rehydrating pagination)

Tag v0.3.16 can be pushed after merge to trigger the PyPI/GitHub release workflow.

Test plan

• Merge and push v0.3.16 tag
• Verify the publish workflow succeeds and the release notes pick up the 0.3.16 changelog section

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