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>

providers/claude-code/statusline-command.sh

@@ -27,7 +27,6 @@ fi
 COLOR_RESET=$'\033[0m'
 COLOR_BOLD_BLUE=$'\033[1;34m'  # dir — identity, always stable
 COLOR_BLUE=$'\033[0;34m'        # tokens — informational, no urgency
-COLOR_CYAN=$'\033[0;36m'        # model — configuration, always stable
 COLOR_GREEN=$'\033[0;32m'       # healthy / within limits
 COLOR_AMBER=$'\033[0;33m'       # attention / approaching a limit
 COLOR_RED=$'\033[0;31m'         # urgent / act now

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"