Fix failing unit test: align Metrics Trends row labels with test expectations

[Copilot]

TestRenderCrossRunReportMarkdown_IncludesNewSections was failing because it asserted the markdown output contains "Cost Trend" and "Token Trend", but renderMarkdownMetricsTrend rendered those rows as "Cost" and "Tokens".

Change

• Renamed table row labels in renderMarkdownMetricsTrend (audit_cross_run_render.go):
  • "Cost" → "Cost Trend"
  • "Tokens" → "Token Trend"

- fmt.Fprintf(os.Stdout, "| Cost | $%.4f | $%.4f | $%.4f | $%.4f | %s |\n", ...)
+ fmt.Fprintf(os.Stdout, "| Cost Trend | $%.4f | $%.4f | $%.4f | $%.4f | %s |\n", ...)

- fmt.Fprintf(os.Stdout, "| Tokens | %d | %d | %d | %d | %s |\n", ...)
+ fmt.Fprintf(os.Stdout, "| Token Trend | %d | %d | %d | %d | %s |\n", ...)

[Copilot]

Pull request overview

This PR fixes a failing markdown rendering unit test by aligning the “Metrics Trends” table row labels with what the test asserts.

Changes:

• Updated the Metrics Trends markdown table label from Cost to Cost Trend.
• Updated the Metrics Trends markdown table label from Tokens to Token Trend.

Show a summary per file

File	Description
pkg/cli/audit_cross_run_render.go	Adjusts markdown table row labels in renderMarkdownMetricsTrend to match unit test expectations.

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