feat: show redirect info in bd prime output (bd-kblo)

When beads is redirected (e.g., in Gas Town crew clones), bd prime now
shows a notice about the redirect. This helps agents understand why
they share issues with other clones.

CLI mode shows:
> ⚠️ **Redirected**: Local .beads → /path/to/target/.beads
> You share issues with other clones using this redirect.

MCP mode shows:
**Note**: Beads redirected to /path/to/target/.beads (shared with other clones)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

beads.go

@@ -50,6 +50,15 @@ func FindAllDatabases() []DatabaseInfo {
 	return beads.FindAllDatabases()
 }
 
+// RedirectInfo contains information about a beads directory redirect
+type RedirectInfo = beads.RedirectInfo
+
+// GetRedirectInfo checks if the current beads directory is redirected.
+// Returns RedirectInfo with IsRedirected=true if a redirect is active.
+func GetRedirectInfo() RedirectInfo {
+	return beads.GetRedirectInfo()
+}
+
 // Core types from internal/types
 type (
 	Issue              = types.Issue