fix(ci): harden project board jq json args

[jorisjonkers-dev-agents]

Summary

• default empty or malformed dynamic JSON inputs before passing them to jq --argjson
• avoid using --argjson for the project number environment value
• normalize paginated cursor, field, view, and option JSON for rerunnable project board setup

Verification

• bash -n on extracted project-board workflow script
• git diff --check