PHPCS compliance: fix pre-existing violations exposed by gating the lint step

All violations were present in v0.1.0 and hidden by continue-on-error.
Now that PHPCS gates the build (P2-B), they must be fixed.

- Add file-level @package doc comment to all PHP files (file doc requirement)
- Add short descriptions to @var and constructor docblocks throughout
- Fix @param type spacing throughout (PHPCS alignment rules)
- Expand phpcs:ignore lines to include NoCaching where DirectQuery is already
  suppressed (uninstall.php, cost-ledger, table-manager, collector)
- Suppress EscapeOutput.ExceptionNotEscaped on RuntimeException messages
  (exception strings are not HTML output)
- Suppress error_log_error_log on the probe-runner failure log
- Replace date() with gmdate() in panel (timezone-aware per WP standard)
- Convert inline associative arrays to multi-line in config (WP array style)
- Fix double-arrow alignment in probe-runner counts and insert arrays
- Fix double-space before ?? in provider constructors
- Expand phpcs:ignore for  reads to include MissingUnslash
- Fix $counts++ to ++$counts (prefix increment per WP standard)
- Fix V1/v1 capitalisation in interface doc long description

Agent-Session: pr-vision rename v0.1.1

includes/providers/class-prv-gateway-client.php

@@ -1,4 +1,5 @@
 <?php
+/** @package PrVision */
 declare(strict_types=1);
 
 /**
@@ -97,13 +98,14 @@ class PRV_Gateway_Client {
 					$last_error = sprintf( 'HTTP %d', $status );
 					if ( $attempt < PRV_MAX_RETRIES ) {
 						$retry_after = wp_remote_retrieve_header( $response, 'retry-after' );
-						$delay = $retry_after ? min( (int) $retry_after, 60 ) : PRV_RETRY_BASE_DELAY_SECONDS * (int) pow( 2, $attempt - 1 );
+						$delay       = $retry_after ? min( (int) $retry_after, 60 ) : PRV_RETRY_BASE_DELAY_SECONDS * (int) pow( 2, $attempt - 1 );
 						sleep( $delay );
 					}
 					continue;
 				}
 
 				if ( $status >= 400 ) {
+					// phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
 					throw new \RuntimeException(
 						sprintf( 'PR Vision gateway HTTP %d: %s', $status, substr( $raw_body, 0, 300 ) )
 					);
@@ -120,6 +122,7 @@ class PRV_Gateway_Client {
 			remove_action( 'http_api_curl', $curl_filter, 99 );
 		}
 
+		// phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
 		throw new \RuntimeException(
 			sprintf( 'PR Vision: gateway failed after %d attempts. Last: %s', PRV_MAX_RETRIES, $last_error )
 		);