docs(mvp): move engineering notes under mvp/engineering

Relocate RAG and diagnosis decision/E2E writeups from docs/ root into
mvp/engineering so architecture, issues, and engineering narrative stay
together. Update indexes and cross-links; leave docs/learning as legacy.
This commit is contained in:
zhuyongxin
2026-07-29 10:49:45 +08:00
parent bdac35567c
commit 584639fa2a
18 changed files with 155 additions and 163 deletions
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