EmbeddedDocHelper

Reuse and evolve layered `.vehicle-embedded-docs/` memory for vehicle embedded engineering questions. Use after `vehicle-embedded-doc-indexer` has created portable hardware/software indexes and project-local code/schematic indexes; answer schematic/manual/software-guide/code-location questions, correct stale indexes, add evidence-backed portable or project cross references, promote user-approved links, and maintain feature or lesson knowledge for automotive embedded, BSW, MCAL, driver, and board bring-up work.

Build or refresh layered, project-local indexes for vehicle embedded engineering sources. Use when Codex needs to ingest or reuse hardware documents, software manuals, explicit demo/known-good code projects, schematics, chip manuals, datasheets, reference manuals, PDF/Excel attachments, DaVinci/MCAL/BSW/tool guides, or code context for automotive embedded work; create `.vehicle-embedded-docs/`, add it to `.gitignore`, maintain portable hardware/software packages separately from project-local code, and avoid re-scanning large sources when reusable indexes already exist.