Merge origin/main into db/fix-2 (resolve conflicts)

docs/CONTRIBUTOR_NAMESPACE_ISOLATION.md

@@ -126,7 +126,7 @@ accordingly:
 
 2. **Routing Configuration** (`internal/config/config.go`):
    ```go
-   v.SetDefault("routing.mode", "auto")
+   v.SetDefault("routing.mode", "")  // Empty = disabled by default
    v.SetDefault("routing.default", ".")
    v.SetDefault("routing.contributor", "~/.beads-planning")
    ```

docs/QUICKSTART.md

@@ -43,6 +43,10 @@ Notes:
 - Dolt backend stores data in `.beads/dolt/` and records `"database": "dolt"` in `.beads/metadata.json`.
 - Dolt backend runs **single-process-only**; daemon mode is disabled.
 
+Notes:
+- SQLite backend stores data in `.beads/beads.db`.
+- Dolt backend stores data in `.beads/dolt/` and records `"database": "dolt"` in `.beads/metadata.json`.
+
 ## Your First Issues
 
 ```bash

docs/ROUTING.md

@@ -45,7 +45,10 @@ bd create "Fix bug" -p 1
 Routing is configured via the database config:
 
 ```bash
-# Set routing mode (auto = detect role, explicit = always use default)
+# Auto-routing is disabled by default (routing.mode="")
+# Enable with:
+bd init --contributor
+# OR manually:
 bd config set routing.mode auto
 
 # Set default planning repo