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

uninstall.php

@@ -8,6 +8,7 @@
  *
  * @see ARCHITECTURE.md — §Uninstall specification.
  * @see class-prv-deactivator.php — Clears cron on deactivation.
+ * @package PrVision
  */
 
 if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
@@ -19,12 +20,12 @@ global $wpdb;
 /* ── 1. Drop the custom table ─────────────────────────────────────── */
 
 $table = $wpdb->prefix . 'prv_ai_visibility';
-// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.SchemaChange, WordPress.DB.PreparedSQL.InterpolatedNotPrepared
+// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.SchemaChange, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.NoCaching
 $wpdb->query( "DROP TABLE IF EXISTS {$table}" );
 
 /* ── 2. Delete all prv_ prefixed options ──────────────────────────── */
 
-// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery
+// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
 $wpdb->query(
 	"DELETE FROM {$wpdb->options} WHERE option_name LIKE 'prv\_%'"
 );