ci: adopt reusable CI + 300-line compliance for v4.7.0

- Replace per-repo CI jobs with thin reusable caller
  (peptide-e2e ci.yml@main; tests:stubs, has_js:true)
- Add permissions: contents: write (required for phpcbf auto-commit)
- deploy.yml: drop file-existence + PHP-syntax redundancy; keep PSA_VERSION check
- class-psa-admin.php: remove 37 dead backward-compat proxy lines (327→290)
- class-psa-ai-generator.php: remove 17 dead backward-compat proxy lines (309→292)
- class-psa-search.php: remove 13 dead backward-compat proxy lines (307→294)
  All three files now comply with the estate 300-line rule.
  Zero external callers of removed methods confirmed.
- package.json / package-lock.json: minimal npm manifest for lint-js npm ci step
- ARCHITECTURE.md: update ci.yml description
- PSA_VERSION: sync constant (was 4.5.0) with header (was 4.6.0) → both 4.7.0

Agent-Session: claude-sonnet-4-6-adopt-ci-20260616

includes/class-psa-admin.php

@@ -287,41 +287,4 @@ class PSA_Admin {
 		return $options[ $key ] ?? $default;
 	}
 
-	// ── Backward-compatible proxies (rendering moved to PSA_Admin_Page) ─
-
-	/** @see PSA_Admin_Page::enqueue_batch_scripts() */
-	public static function enqueue_batch_scripts( string $hook ): void {
-		PSA_Admin_Page::enqueue_batch_scripts( $hook ); }
-
-	/** @see PSA_Admin_Page::render_section_description() */
-	public static function render_section_description(): void {
-		PSA_Admin_Page::render_section_description(); }
-
-	/** @see PSA_Admin_Page::render_api_key_field() */
-	public static function render_api_key_field(): void {
-		PSA_Admin_Page::render_api_key_field(); }
-
-	/** @see PSA_Admin_Page::render_model_field() */
-	public static function render_model_field(): void {
-		PSA_Admin_Page::render_model_field(); }
-
-	/** @see PSA_Admin_Page::render_validation_model_field() */
-	public static function render_validation_model_field(): void {
-		PSA_Admin_Page::render_validation_model_field(); }
-
-	/** @see PSA_Admin_Page::render_publish_field() */
-	public static function render_publish_field(): void {
-		PSA_Admin_Page::render_publish_field(); }
-
-	/** @see PSA_Admin_Page::render_pubchem_field() */
-	public static function render_pubchem_field(): void {
-		PSA_Admin_Page::render_pubchem_field(); }
-
-	/** @see PSA_Admin_Page::render_budget_field() */
-	public static function render_budget_field(): void {
-		PSA_Admin_Page::render_budget_field(); }
-
-	/** @see PSA_Admin_Page::render_settings_page() */
-	public static function render_settings_page(): void {
-		PSA_Admin_Page::render_settings_page(); }
 }