Anchor the indicator-cli .gitignore entry to the repo root

Unanchored, it also matched cmd/indicator-cli/ (any path segment
named indicator-cli, not just the build output at the repo root),
which silently offered to skip the source directory on git add.

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

Author: cinar

.gitignore

@@ -10,7 +10,7 @@
 bin
 indicator-backtest
 indicator-sync
-indicator-cli
+/indicator-cli
 /mcp/mcp
 
 # Test binary, built with `go test -c`