Build immutable offline global tileset pipeline

[Occumed79]

Summary

• replace the active runtime gateway/Neon cache/geometry path with a fail-closed immutable PMTiles store that returns stored MVT bytes unchanged
• keep one browser source and explicitly disable MapLibre parent/child fallback stretching
• add a deterministic offline plan, SHA-locked input localization, layer authority normalization, exact clipping, duplicate/overlap removal, malformed/oversized/tile-footprint rejection, atomic PMTiles packing, and complete-manifest finalization
• assign split-prefix ancestor tiles explicitly so every addressed z0-z16 tile has exactly one prebuilt owner
• remove the external terrain source and use opaque preblended depth colors to eliminate alpha-overdraw seams
• add mandatory static and exact-camera motion validation for footprints, vertical/horizontal seams, stretching, neighbor inconsistency, blanks, and source switching

Built validation artifact

• artifact version: 27265b07293da7e3c593fcfa6916272a89c97e44c292c983d320f19a5c3e8629
• size: 258,545,615 bytes
• addressed tiles: 11,240
• build duration: 485.117 seconds
• 413 tile-shaped features quarantined
• 19,896 exact duplicates removed
• 2,934 contained overlaps removed

The artifact is a deliberately partial, representative validation fixture. Production rejects partial manifests unless the explicit validation-only override is set.

Validation

• npm run build
• real release owner plan: 5,782 physical owners / 2,180 logical z6 cells / 754 locked regional inputs
• real Fresno owner enumeration: 1,106,457 exact output addresses from 2,748,048 input addresses
• real four-tile owner PMTiles smoke build: verified, zero malformed/oversized/footprint rejections
• 9 required static views and 30 exact-camera motion checkpoints
• zero rectangular footprints, seams, stretched polygons, inconsistent neighbors, blank frames, source switches, page errors, or network errors
• final screenshots inspected manually, including Pacific, antimeridian, Atlantic transition, Fresno regional, city, and street views

Remaining production-scale work

The complete 269.3 GB regional input inventory cannot fit in this workspace, so the full 5,782-owner production artifact was not built here. The checked-in pipeline and per-owner orchestration are ready for a sufficiently provisioned offline build host, and deployment remains fail-closed until every owner report is present.

No generated PMTiles artifact, downloaded input archive, or screenshot is included in this PR.

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