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**Mateo Court**, a courtyard block in the Arts District — a third pack and a third *kind* of building. Two office floors and a shed already existed, so this is the plan the format had not been shown: a ring of rooms round an open-air yard with **no corridor anywhere**. Every door opens onto the yard, and the yard does the job a corridor does in the other two. It is also the first pack whose `ceiling: null` means there is genuinely no ceiling at any height rather than "take the lid off so the shot can see in", and the first sited off the Bay Area board at all. That last part needed a fix, not just a coordinate. `OFFICE_MARKERS` was gated on `id === "sf"`, which was correct for exactly as long as every office was in the Bay Area — it would have kept the Los Angeles building off the Los Angeles board and pinned it to San Francisco's. The gate is the board's own bounds now, which is the same question asked honestly. Every door through the 0.25 m courtyard skin is 1.2 m rather than the usual 0.9, and that is not a style choice: `blocked` inflates by the walker's radius *and* the wall's thickness, so a 0.9 m leaf through a wall that thick seals the room behind it while rendering perfectly. Two rooms were sealed exactly that way on the first pass. The test says so, because a well-meaning edit back to 0.9 for consistency would do it again. **People move.** `samplePresenceAt` thinned the roster by hour, which fixed a building that was full at 1 a.m., but everybody was still pinned to their own desk all day. Occupancy is a hand-written booking table now: meetings fill a room for a plausible length, the kitchen island fills at lunch, and a `Presence` binds to a seat id — so "in a meeting" means occupying a meeting-room seat, and the whole thing is choosing seat ids rather than inventing positions. The flood fill that checks a pack is walkable existed three times over. One copy now, since the third is where a divergence lives. **Films.** A new `office-dusk` reel — six hours over Lumbridge HQ catching the moment the house lights take over from the sun, which is the one thing only a time-lapse can show and which did not exist. The three existing reels are re-rendered rather than re-captioned: `films.ts` in v4 named a commit eleven behind HEAD, so the published reels were shot before there were any clouds and before the city drew office pins. Reviewers caught roughly a dozen false statements in the new prose across these files — a room census that did not add up, a wall-thickness count, a claim that every room has daylight when one does not, and a cost figure saying `updateSun` runs once a second when it runs once a minute. The consequential ones are fixed. In a codebase where the comments are the design record, a confident wrong number is a defect. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>