[callumreid]

• Add --skippable-metric-ids and JSON request support to review-project creation and updates. Preserve the difference between an omitted setting, an empty list (none eligible), and explicit null (all linked metrics eligible).
• Reconcile Monday's API parity report: all 451 published request fields on covered commands are modeled; 119/186 operations have first-class commands and the remaining 67 are existing reviewed exceptions.
• Regression reproduced on 73ba74b before the fix: JSON metric selections were silently dropped. Request capture tests now cover both endpoints, arrays, empty arrays, null, flag values and omitted PATCH settings. Validation: cargo fmt, clippy, 217 Rust tests, 63 automation tests, Python lint/format and live API coverage audit. One unrelated update-notification test timed out with default parallelism; rerun with four test threads passed.