Add a proposed architecture RFC to make the examples folder thin: each
example becomes mostly an invocation of an app package. A shared
dsh-agent-core bundle owns the providerless spine; dsh-stdio-agent and
dsh-acp-agent app packages bake in their coupled front-door cluster
(UI + logger/hmr policy + agent pre-creation), turning the ACP
stdout-purity footgun into a property of the artifact. Leaf cordis.yml
shrinks to backends + config; start.ts is dropped in favor of a package
bin.
Supersedes the providerless-example-base RFC (cross-linked) and indexes
the new RFC under Proposed -> Architecture.
Tianyi Cui
034779d761