818 stripped the source map because it had stale paths. Empirically that
made coder agents far slower — they spent most of each session re-discovering
the codebase via Read/Grep before reaching any Edit, and ran out of turn
budget without committing.
Restoring a fresh source map keyed off current master. Uses directories
where possible so it stays useful through future decomposes, plus a
"Canonical examples" section pointing at the patterns to copy when adding
new CRDT collections, RPC handlers, services, chat commands, etc.
This is a stopgap until 819 (auto-generated source-map-gen) lands.
dave
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