Shipped the town picker in hud.js (which already owns its DOM overlay -> NO index.html seam). A compact
<select> in the HUD (top-left, pointer-events:auto), 9 options: synthetic + 3 OSM fixtures (osmTownKeys
minus _real) + 5 real-road caches (Katoomba/Newtown/Fremantle/Bendigo/Castlemaine, hardcoded REAL_TOWNS --
no manifest yet, beta derives it). Selecting navigates: synthetic clears plansrc/town; a town sets
?plansrc=osm&town=<key>, preserving all other params. Current pre-selected; unknown-current still shown.
Verified end-to-end: picked katoomba_real through the dropdown -> booted real Katoomba (966 edges/323
intersections/3 venues), 0 errors. Lives inside #pc-hud so hud.setVisible(false) hides it for money shots.
-> F (B->F seam): NONE -- self-contained in hud.js (already constructed by createHUD). Gate it behind ?dbg
with one setVisible call if you prefer; left always-in-HUD as a modest debug-grade feature.
Corner-strips spot-check (R18 failure-item #3): ground fills real intersections OK -- degree-4 junction
(58 exist) shows road strips overlap-filling the junction, lane markings + zebra crossing render, no gross
gap. Acceptable for alpha; finer acute-angle pass = beta.
Budget note -> F (measured vs A's UNCOMMITTED WIP -- caveat, not a defect): F's BIG_CITY one-liner is live
(chunks 50->26). But venue block still ~237k tris at night against the current tree, which carries A's
uncommitted R19 finalization (plan_osm modified; graph grew 799->966 edges, junction-joining in but the
far-island CULL not yet). Fable's ruling: the cull is "half of B's tris problem" -> the <=200k gate needs
F's fix AND A's committed cull. Re-measure the busiest real block after A pins (the deferred tris-post-cull
re-measure genuinely waits on A's commit; the dev server serves other lanes' uncommitted edits).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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