chore: consolidate new foundation and archive v1 (#1495)

README.md

@@ -1,10 +1,25 @@
-# Minimal Mosaic Stack container POC
+# Mosaic Stack — new foundation
 
-Standalone experiment, not part of the Mosaic Stack repository or Software Factory.
+The active rebuild is at this repository's root. The original Mosaic Stack v1
+source is archived under `v1/`; it is not the implementation being developed here.
 
-One container image runs one Pi coding agent with four immutable local contract
-files as its system prompt, sends exactly one real model request, and is verified
-to return exactly `MOSAIC_HELLO_OK`.
+- Canonical checkout: `/mnt/storage/src/mosaic-stack`
+- Repository: `mosaicstack/stack`
+- Working branch: `refactor`
+- Former `~/src/mosaic-stack-dev-test`: compatibility symlink to this same checkout
+
+Both original Git histories and pending development work are preserved. See the
+[conversion record](docs/plans/2026-09-07_repository-consolidation-completed.md)
+and [current next action](docs/plans/CURRENT.md). Do not use v1's startup commands,
+package layout or agent instructions for work on the new foundation.
+
+## Original container proof
+
+The foundation began as a standalone container experiment. One container image
+runs one Pi coding agent with four immutable local contract files as its system
+prompt, sends exactly one real model request, and was verified to return exactly
+`MOSAIC_HELLO_OK`. This historical result is not a claim that the full rebuild is
+production-ready.
 
 ## Layout