The Southland gets a door, and the people in it move

**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>

src/offices/sites.ts

@@ -44,16 +44,31 @@ export const FRONTIER_VALLEY_SITE: OfficeSite = {
   label: "Alameda Point",
 };
 
+/**
+ * A courtyard block in the Arts District, square to the pueblo grid rather than
+ * to the compass — which is the whole reason `heading` is a field. See
+ * `mateo-court.ts` for where the numbers come from: 1.2 m is a loading dock, and
+ * 36° is the 1781 survey the downtown street grid still follows.
+ */
+export const MATEO_COURT_SITE: OfficeSite = {
+  lat: 34.0395,
+  lng: -118.2288,
+  elevation: 1.2,
+  heading: 36,
+  label: "Arts District, Los Angeles",
+};
+
 /**
  * Every building this build can walk into, for the city to point at.
  *
  * `id` matches the pack's own `Office.id` and the `OFFICES` table in `main.ts`,
  * which is what lets a click on a marker resolve to a door. Keeping the three in
- * step is not enforced by the type system; it is enforced by there being exactly
- * two of them and by `office.test.ts` asserting that each pack's site is the one
- * named here.
+ * step is not enforced by the type system; it is enforced by there being three of
+ * them and by `office.test.ts` asserting that each pack's site is the very
+ * object named here — identity, not equality, so a restated coordinate fails.
  */
 export const OFFICE_SITES: { id: string; name: string; site: OfficeSite }[] = [
   { id: "lumbridge-hq", name: "Lumbridge HQ", site: LUMBRIDGE_HQ_SITE },
   { id: "frontier-valley", name: "Frontier Valley", site: FRONTIER_VALLEY_SITE },
+  { id: "mateo-court", name: "Mateo Court", site: MATEO_COURT_SITE },
 ];