Correct the VANITY floor to 0.10.4; bring DESIGN.md up to draft 7

The manifest asked for VANITY 0.10.0, but the Forge seams only landed in
0.10.4. Below that floor the seams are absent and every delve emits the 9
chat cards and 3 folders the spike measured — the exact failure the seams
exist to prevent. The README said 0.10.5, which was safe but wrong; both
now say 0.10.4 and say why.

DESIGN.md still described the tool as an unreleased core with one theme.
It now matches what shipped: seams merged and released, the Foundry slice
at v0.6.0, 16 themes across 5 geometries, 39 tests, the pack validator and
the authoring layer. The features pool is motif-scoped now, so the "last
piece of generic furniture" is gone.

Open questions gain the one that matters: DELVE has never been run at a
live table, and no amount of desk validation will close that.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

foundry-module/module.json

@@ -14,7 +14,7 @@
         "type": "system",
         "manifest": "https://raw.githubusercontent.com/slaguru666/Vanity/main/system.json",
         "compatibility": {
-          "minimum": "0.10.0"
+          "minimum": "0.10.4"
         }
       }
     ]