Goal: Add meaningful progression and emergent decision-making.
- Implemented Nodes (T1–T4) with escalating tiers and milestone bonuses.
- Added one-time upgrades (e.g., Mechanical Keyboard, Subnet Masking) to shape build variety.
- Introduced Trace as a tension mechanic that naturally forces operators into prestige.
- Built Zero-Day Exploit as a risk/reward engine: execute for big data reward + trace spike.
- Added tier unlock gating (requires Lv 50 on previous tier nodes); gives operators mid-run goals.