[Sagyam]

Picks up two items PR #37 left in the roadmap: collection sets and neighbourhood names with corner signs. As decided in the thread, a finished set pays a box.

Daemon

• layout.rs: NEIGHBOURHOODS groups each lot block into one of six: Millbrook, Old Town, Church Hill, The Canal Quarter, The Exchange, Highgate. Parks keep their own names.
• world.rs: every street with lots and every neighbourhood is a set. Building its last lot opens one box, once. Ruins and renames don't take it back, and renaming doesn't pay again. Odds are STREET_RARE_PCT (15) and NEIGHBOURHOOD_RARE_PCT (40). The pity counter is shared with the goal boxes, and the roll comes from the ledger.
• economy::open_box now takes the rare odds rather than a Goal.
• Proto: World.sets (SetInfo: built/total/done), Layout.neighbourhoods, BoxInfo.set. All are serde(default). proto.ts mirrors them.

App

• Desk: the two sets nearest done appear as rows under today's goals. Town hall: a Sets section lists every set begun.
• City: each shown block's north-east corner has a green post with two blades naming the streets that meet there. Neighbourhood names float over their blocks as screen-size labels and fade in between 200 and 300 m of camera distance.
• The mock mirrors the sets.

Checks

• cargo test (137 in the daemon, incl. a_finished_set_pays_one_box and every_lot_block_is_in_one_neighbourhood), cargo clippy --all-targets and cargo fmt are clean.
• bun test (46) and tsc pass.
• Headless screenshots of the City mock: labels zoomed out, and the Main Street / Station Road sign at street level. The City still draws about 40 fps.
• Not run against the real daemon; there's a new host check for it in the roadmap.

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