Share section classification across declaration analysis and mapping parsing. Preserve external URLs, malformed section reasons, section paths and safe sibling declarations without fetching nested maps.
Refs #5466. All 50 focused tests passed, including real CLI and stdio MCP regressions; typecheck and lint passed.
Share the required mappings field contract and retain readable declarations across malformed indexed leaves while marking graph coverage partial.
Refs #5469.
morluto