chore: wp.org submission prep — v0.1.3

Rebrand to RangerHQ Buddy and prepare for the WordPress.org Plugin
Directory. Same workflow as rangerhq-radio v0.7.0 → v0.7.5.

Changes:
- Plugin Name: Buddy → RangerHQ Buddy (matches family naming)
- Plugin URI: icanhelp.ie/buddy → davidtkeane.com/rangerhq-buddy
- Author URI: rangersmyth.xyz → davidtkeane.com
- Text Domain: buddy → rangerhq-buddy (62 occurrences across 8 PHP files)
- Add LICENSE file (full GPL v2 text from gnu.org)
- Add wp.org-format readme.txt with all 8 required headers
- Remove inc/updater.php (self-hosted Gitea updater forbidden for
  wp.org-hosted plugins per the rangerhq-radio v0.7.3 walkback)
- Replace mt_rand with wp_rand in inc/state.php for better RNG
- Add 5 translator comments for printf-style i18n placeholders
- Wrap 2 dashboard-widget.php printf placeholders in (int) casts
- Add tests/ to .gitignore (PCP reports are local-only)

PCP audit: 85 issues → ~1 (the .gitignore file itself, stripped from
the submission zip).
Plugin Check Namer Tool: "Generally Allowable" verdict on both name
and slug.
Plugin URI https://davidtkeane.com/rangerhq-buddy/ returns HTTP 200.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

inc/sprite.php

@@ -44,7 +44,10 @@ function buddy_render_sprite( $species = 'default', $tone = 'happy', $size = 'md
          viewBox="0 0 100 100"
          xmlns="http://www.w3.org/2000/svg"
          role="img"
-         aria-label="<?php echo esc_attr( sprintf( __( 'Buddy is %s', 'buddy' ), $tone ) ); ?>">
+         aria-label="<?php
+            /* translators: %s is the Buddy's mood tone (happy / neutral / sad / wink) */
+            echo esc_attr( sprintf( __( 'Buddy is %s', 'rangerhq-buddy' ), $tone ) );
+         ?>">
         <!-- body -->
         <circle cx="50" cy="55" r="32" fill="<?php echo esc_attr( $body_fill ); ?>" stroke="#c9941d" stroke-width="2" />
         <!-- left eye — always an open circle in the SVG. When the