chore: fix shellcheck warnings

- Remove unused COLOR_CYAN variable from statusline-command.sh
- Add shellcheck disable directive to deploy-manifest.sh (variables sourced by install.sh)

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

scripts/deploy-manifest.sh

@@ -3,6 +3,7 @@
 # All paths: src relative to REPO_ROOT, dest relative to HOME.
 # Format: "src:dest"
 
+# shellcheck disable=SC2034
 # Individual files — copied verbatim
 DEPLOY_FILES=(
   "providers/claude-code/CLAUDE.md:.claude/CLAUDE.md"