PHPCS: fix remaining violations (EscapeOutput, InterpolatedNotPrepared, missing @param)

- Collapse multi-line RuntimeException throws to single line so
  phpcs:ignore EscapeOutput.ExceptionNotEscaped applies correctly
  (gateway-client, perplexity-provider, openrouter-provider)
- Move phpcs:ignore InterpolatedNotPrepared from SQL string line to
  the get_results/get_var line where the violation fires (collector)
- Add descriptions to @param trendline and @param standings in panel
- Remove duplicate phpcs:ignore comment in collector

Agent-Session: pr-vision rename v0.1.1

includes/panel/class-prv-ai-visibility-panel.php

@@ -87,7 +87,7 @@ class PRV_Ai_Visibility_Panel implements PRV_Dashboard_Panel {
 	/**
 	 * Render the Chart.js visibility score trendline.
 	 *
-	 * @param array<int, array{run_id: string, captured_at: string, score: float}> $trendline
+	 * @param array<int, array{run_id: string, captured_at: string, score: float}> $trendline Trendline data points.
 	 *
 	 * @return void
 	 */
@@ -122,7 +122,7 @@ class PRV_Ai_Visibility_Panel implements PRV_Dashboard_Panel {
 	/**
 	 * Render the per-peptide current standings table.
 	 *
-	 * @param array<string, array{label: string, cited: bool, our_position: int|null, top_domains: string[], model_count: int}> $standings
+	 * @param array<string, array{label: string, cited: bool, our_position: int|null, top_domains: string[], model_count: int}> $standings Per-peptide standing data.
 	 *
 	 * @return void
 	 */