Update SPC ArcGIS products and harden the SDK

[Reddimus]

Summary

• replace scattered ArcGIS layer IDs with a tested product/day/hazard table, including watches, conditional intensity, days 4-8, and extended fire outlooks
• normalize ArcGIS geometry and probability fields, discard explicit no-risk sentinel polygons, and refresh captured fixtures
• update dependencies and CI with warnings-as-errors, clang-tidy, sanitizers, package-install and consumer coverage
• tighten pagination, URL handling, process-wide curl initialization, documentation, and package metadata

Validation

• 40/40 tests with AddressSanitizer and UndefinedBehaviorSanitizer
• clang-format 18 and clang-tidy
• automated C++ audit and Markdown lint
• install plus find_package and FetchContent consumer builds
• all 28 fixture checksums
• live NOAA ArcGIS 11.3 metadata and all 39 feature layers

Closes the stale ArcGIS routing and SDK maintenance gaps.

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