## tracecmp report: zuul.jsonl

- build: eventlive-dd38117-20260908T0916Z  started: 2026-09-08T09:33:49Z  inline_max: 256
- calls: 8  compared: 8  diverged: 0  invalid records: 0  warnings: 0
- coverage: 8 guarded call(s), 0 undeclared write(s) in 0 call(s); 0 hook(s) unstated, 0 contradicted

| hook | calls | modes | compared | diverged | errors |
|---|---|---|---|---|---|
| Game::TechTree::ProcessResearch | 8 | compare:8 | 8 | 0 | 0 |

### coverage

| hook | verdict | compared regions | guards | undeclared writes | unmodelled |
|---|---|---|---|---|---|
| Game::TechTree::ProcessResearch | partial | events, node[0], node[106], node[107], node[108], node[109], +231 | player, tree_header | 0 | 6 |

#### Game::TechTree::ProcessResearch — not checked by this run
- (medium) posts EVENT_RESEARCH_OVERBUDGET on the owner's EventStorage: ours reproduces the decision and the id sequence, so region:events compares next_id, but the composed EvDsc/EvMsg text is not reproduced and no region can see it — text comes from the game's string table, which the engine must not carry; ours posts into its own EventStorage and writes only the counts into the scratch copy, so no live byte moves and replace mode posts nothing at all  [region:events]
- (medium) posts EVENT_TECHS_UNLOCKED once after the per-node loop, for the nodes SetResearched made available this turn — the set comes from the child-unlock cascade, which ours does not run; the pass driver takes the unlock list as an input and is given `no list` rather than an empty one, so a missing input cannot look like a modelled negative. Expect region:events to under-count next_id by exactly 1 on every call that completes a tech  [region:events]
- (high) appends to the owner's vector<ObservedTech> (ServerPlayer+0x274) on every tech completion — serialized ServerPlayer state that no coverage note in B2 or B3 mentioned until lane R's guard caught it. The element is now fully pinned (sizeof 44, {u16 turn_first, u16 turn_last, bool detected, string tech_name, int with}) and the append de-duplicates by tech name, but ours still does not append; the region reports the byte span, which must grow by exactly 44 per completion  [region:observed_techs]
- (high) TechTree::SetResearched on completion: the turn/order stamps, the child unlock cascade, the recursive research of zero-cost children, and the owner's OnTechResearched callback — its own milestone (B2); the callback writes live player state that compare mode must not touch, and it consumes one extra RNG word  [guard:player, guard:tree_header]
- (medium) bumps the tree's completion-order counter (TechTree+0x20) — part of SetResearched; the per-node `order` word is compared but the counter it comes from was not a region  [guard:tree_header]
- (low) writes a completion line to the game log — log text is not simulation state