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

pr-vision.php

@@ -13,6 +13,7 @@
  * @see ARCHITECTURE.md — Full data flow and file tree.
  * @see CONVENTIONS.md  — Naming patterns and extension guide.
  * @see CONTEXT.md      — Domain glossary incl. the visibility score formula.
+ * @package PrVision
  */
 
 declare(strict_types=1);
@@ -29,22 +30,22 @@ define( 'PRV_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
 define( 'PRV_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
 define( 'PRV_SCHEMA_VERSION', 1 );
 
-/** @var int Maximum HTTP retries for LLM API calls. */
+/** Maximum HTTP retries for LLM API calls. @var int */
 define( 'PRV_MAX_RETRIES', 3 );
 
-/** @var int API request timeout in seconds. */
+/** API request timeout in seconds. @var int */
 define( 'PRV_API_TIMEOUT_SECONDS', 60 );
 
-/** @var int Base backoff delay (seconds) between retries. */
+/** Base backoff delay (seconds) between retries. @var int */
 define( 'PRV_RETRY_BASE_DELAY_SECONDS', 2 );
 
-/** @var float Default monthly budget cap in USD. */
+/** Default monthly budget cap in USD. @var float */
 define( 'PRV_DEFAULT_MONTHLY_BUDGET_USD', 5.0 );
 
-/** @var string WP-Cron hook name for the weekly probe run. */
+/** WP-Cron hook name for the weekly probe run. @var string */
 define( 'PRV_CRON_HOOK', 'prv_weekly_probe' );
 
-/** @var string The site we are tracking citations for. */
+/** The site we are tracking citations for. @var string */
 define( 'PRV_TARGET_DOMAIN', 'peptiderepo.com' );
 
 /* ── Autoloader ───────────────────────────────────────────────────────── */