Artifact: Full Leadership Decision Set — Platform Team Q4

Three assembled artifacts sharing one internally coherent team context -- exercises co-01, co-05, co-06, co-10, co-12, co-13, co-14. Everline and every name here are fictional; every detail is an illustrative, constructed example.

Growth plan (Chris, Engineer -> Senior Engineer): building on prior calibration evidence (two adopted design notes this quarter), the next-level behavior to practice is leading a design review for someone else's proposal, not just writing his own -- the ladder rung for "reviews and improves others' designs, not just proposes his own" is the named gap.

Prioritization decision record (Q4): competing demands are the Conway's-Law-driven reorg, the remaining two-thirds of the ETL rewrite, and a customer-escalated request for faster multi-currency support. Decision: execute the reorg first (a structural change is cheaper before more work lands on the current team shape), continue the ETL rewrite in parallel at reduced pace, and hold the multi-currency acceleration request until Q1 -- communicated to product with the same reasoning style as the earlier roadmap trade-off memo.

Technical strategy note (Q4 addendum): reaffirms the team's three standing bets, adding that Bet 2 (schema-registry contract testing) is now higher-priority given the reorg's predicted boundary hardening -- the contract-testing discipline needs to be in place before the Ingestion/Serving split, not after, or the boundary will harden around an undocumented format instead of a versioned one.

Coherence check: Chris's growth assignment (leading design reviews) directly supports the contract-testing rollout the strategy note just re-prioritized -- reviewing other engineers' contract-test designs is a concrete, real venue for exactly the next-level behavior his growth plan names. No artifact contradicts another: the reorg proceeds before the ETL work slows further, and the strategy's newly-elevated priority (contract testing) has a named engineer (Chris) growing into exactly the skill it needs.