fix(bundle): mount the projection cache in the base overlay

The cache now owns its storage root (dshHomePath('projections')), so the
mount moves from the web-app overlay to base with that root declared, next
to the other base session layers. web-app inherits it; its overlay mount is
removed.

packages/bundle/base/cordis.patch.yml

@@ -100,6 +100,13 @@
       config:
         root: !!js dshHomePath('sessions')
 
+    - id: session-projection-cache
+      name: '@deepseek-ai/dsh-session-projection-cache'
+      config:
+        root: !!js dshHomePath('projections')
+        writeEveryEvents: 200
+        writeIntervalMs: 5000
+
     # Durable image bytes live outside the append-only session log. Messages
     # keep content-addressed references that this shared backend resolves for
     # provider requests and authorized history reads.

packages/bundle/base/package.json

@@ -74,6 +74,7 @@
     "@deepseek-ai/dsh-session-checkpoint-policy": "workspace:^",
     "@deepseek-ai/dsh-session-persistence-jsonl": "workspace:^",
     "@deepseek-ai/dsh-session-projection": "workspace:^",
+    "@deepseek-ai/dsh-session-projection-cache": "workspace:^",
     "@deepseek-ai/dsh-session-query-sqlite": "workspace:^",
     "@deepseek-ai/dsh-session-telemetry-otel": "workspace:^",
     "@deepseek-ai/dsh-session-title": "workspace:^",

packages/bundle/web-app/cordis.patch.yml

@@ -73,12 +73,6 @@
     - id: workspace
       name: '@deepseek-ai/dsh-workspace'
 
-    - id: session-projection-cache
-      name: '@deepseek-ai/dsh-session-projection-cache'
-      config:
-        writeEveryEvents: 200
-        writeIntervalMs: 5000
-
     # Whole-log turn/step counts for the chat stats strip (the sessionStats
     # projection key); the projection registry itself is a base-layer row.
     - id: session-stats