PR Vision v0.3.0: per-call cost accountability + LLM call audit trail

P0 security:
- PRV_Gateway_Client: remove response body from RuntimeException (HTTP status only)
- PRV_Capture_Writer: allowlist-only write (prompt/response text, never headers/auth)
- Mandatory capture order: can_afford → probe → persist_result → update_row_cost → write_meta → capture_io
- capture_io last and wrapped in swallowing try/catch

New tables (SCHEMA_VERSION 3):
- prv_call_meta: cost/metadata per call, kept indefinitely
- prv_call_io: rendered prompt + raw response, pruned on retention window (default 90d)

New classes:
- PRV_Call_Meta_Table, PRV_Call_Io_Table: table schema + dbDelta
- PRV_Capture_Writer: metadata + I/O write; security allowlist enforced
- PRV_Prune_Cron: daily prv_daily_prune cron deletes aged prv_call_io rows only
- PRV_Cost_Rollup_Query: MTD summary, model breakdown, drill-down, projection
- PRV_Call_Log_Query: paginated + filtered call-log query + per-call I/O fetch
- PRV_Costs_Page + PRV_Costs_Renderer: Costs admin sub-page (cap progress, bento, model table, drill-down)
- PRV_Call_Log_Page + PRV_Call_Log_Table_Renderer: Call Log admin sub-page (filter bar, paginated table, WCAG AA pagination)
- PRV_Call_Drawer_Renderer: non-modal complementary drawer (5 states: Normal/Pruned/Legacy/Failed/Loading)
- PRV_Call_Drawer_Script: inline JS for drawer (300-line split from renderer)
- PRV_Call_Detail_Ajax: wp_ajax_prv_call_detail AJAX handler
- PRV_Admin_Page_Css: CSS provider (300-line split from PRV_Admin_Page)
- PRV_Probe_Run_Executor: inner probe loop (300-line split from PRV_Probe_Runner)

Updated:
- PRV_Probe_Result: tokens_in/tokens_out params + getters
- Both providers: report tokens_in/tokens_out from usage.prompt_tokens/completion_tokens
- PRV_Probe_Runner: slimmed to lock+UUID+delegation; injects PRV_Capture_Writer
- PRV_Config: get_io_retention_days(); PRV_IO_RETENTION_DEFAULT_DAYS constant
- PRV_Upgrader/Activator/Deactivator/Plugin: register new tables, cron, pages, AJAX
- Settings: retention days field + save in controller
- uninstall.php: DROP both new tables, clear prv_daily_prune cron
- Subnav 4-tab strip (Dashboard | Costs | Call Log | Settings) on all pages
- ARCHITECTURE.md, CHANGELOG.md, CONTEXT.md, CONVENTIONS.md updated

Tests:
- test-capture-writer.php: write_meta, write_io, P0 security (401 record has no key/Bearer/sk-or-)
- test-cost-audit.php: MTD reconciliation, projection, prune, forced capture_io exception, table drops

Agent-Session: peptiderepo-geomonitor-v0.3.0-cost-audit

includes/core/class-prv-probe-result.php

@@ -13,6 +13,8 @@ declare(strict_types=1);
  * Returned by every PRV_Probe_Provider implementation. Immutable — all
  * fields are set in the constructor and read via typed getters.
  *
+ * v0.3.0 adds tokens_in/tokens_out for per-call cost attribution.
+ *
  * Who triggers: PRV_Perplexity_Provider and PRV_OpenRouter_Provider.
  * Dependencies: None.
  *
@@ -31,13 +33,17 @@ class PRV_Probe_Result {
 	 * @param bool     $cited          Whether peptiderepo.com appears in source_domains.
 	 * @param int|null $our_position   1-based position of peptiderepo.com in sources, or null.
 	 * @param float    $cost_usd       Estimated call cost in USD.
+	 * @param int|null $tokens_in      Input token count from the API response (null if unknown).
+	 * @param int|null $tokens_out     Output token count from the API response (null if unknown).
 	 */
 	public function __construct(
 		private readonly string $raw_excerpt,
 		private readonly array $source_domains,
 		private readonly bool $cited,
 		private readonly ?int $our_position,
-		private readonly float $cost_usd
+		private readonly float $cost_usd,
+		private readonly ?int $tokens_in = null,
+		private readonly ?int $tokens_out = null
 	) {}
 
 	/**
@@ -84,4 +90,22 @@ class PRV_Probe_Result {
 	public function get_cost_usd(): float {
 		return $this->cost_usd;
 	}
+
+	/**
+	 * Get the input token count for this call (null if not reported by provider).
+	 *
+	 * @return int|null
+	 */
+	public function get_tokens_in(): ?int {
+		return $this->tokens_in;
+	}
+
+	/**
+	 * Get the output token count for this call (null if not reported by provider).
+	 *
+	 * @return int|null
+	 */
+	public function get_tokens_out(): ?int {
+		return $this->tokens_out;
+	}
 }