docs: 1.0 documentation restructure

Split root CLAUDE.md into 19 per-directory files scoped to their source area.
Roll v0 history into docs/ARCHIVE.md; retire CONTEXT.md, CONTEXT-ARCHIVE.md,
PLAN.md, COMPLETED.md. Move plan docs under docs/. Rescue 9 live deferrals
into docs/TODO.md.

docs/product/audit-notes/q-w0-t2-architecture.md

@@ -10,7 +10,8 @@ flatness, naming families) are **not restated**; where a finding below touches t
 is because the functional mechanism is new.
 
 Every claim below was verified by grep/read of the actual tree. Line numbers are as of this
-audit's snapshot. Wave assignments reference PLAN.md §Q-W1..Q-W6.
+audit's snapshot. Wave assignments reference the Q-W1..Q-W6 waves (landed history in
+`docs/ARCHIVE.md`; sequencing in `docs/product/code-organization.md` §5).
 
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