fix: eliminate piped while loops in token optimizer workflows

[lpcox]

Follow-up to PR #24350 — applies the same pipefail-safe patterns to the remaining token workflows.

Changes

Optimizer workflows (copilot + claude)

Replace find | head -1 | while read piped pattern with command substitution:

# Before (SIGPIPE risk under pipefail)
find ... | head -1 | while read -r f; do cp "$f" ...; done

# After (safe)
FOUND_MD=$(find ... | head -1 || true)
if [ -n "$FOUND_MD" ]; then cp "$FOUND_MD" ...; fi

Claude analyzer consistency fix

Align jq invocation with copilot variant:

• Use []?.databaseId (optional object access) instead of .[].databaseId
• Add 2>/dev/null || true error handling

Affected workflows

• copilot-token-optimizer.md
• claude-token-optimizer.md
• claude-token-usage-analyzer.md (jq consistency fix only)