## tracecmp report: recap-b3-compare.jsonl

- build: recap-7584bad-20260908T0615Z  started: 2026-09-08T06:28:40Z  inline_max: 256
- calls: 3  compared: 3  diverged: 1  invalid records: 0  warnings: 0
- coverage: 3 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 | 3 | compare:3 | 3 | 1 | 0 |

### coverage

| hook | verdict | compared regions | guards | undeclared writes | unmodelled |
|---|---|---|---|---|---|
| Game::TechTree::ProcessResearch | partial | events, node[0], node[105], node[106], node[107], node[108], +270 | player, tree_header | 0 | 5 |

#### Game::TechTree::ProcessResearch — not checked by this run
- (high) posts EVENT_RESEARCH_OVERBUDGET on the owner's EventStorage in the same branch that sets node.flag = 2 — the message text is composed from the tech name, so ours cannot synthesise it; it would have to be posted through the game's own event API. This is the defect that made a clean compare false: replace mode's autosave differed from the oracle by exactly this one event  [region:events (EvNxID now diverges instead of passing silently)]
- (medium) posts EVENT_TECHS_UNLOCKED for nodes that became available this turn — the trailing unlock loop makes no draw and writes no node, but it does build a names list and post an event  [region:events]
- (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

### Game::TechTree::ProcessResearch: first 1 of 1 divergent call(s)
- call_id 0 (recap-b3-compare.jsonl:2)
    side.events.after.v.next_id [exact] orig={"t":"i32","v":4} ours={"t":"i32","v":3}