Add riosodu@black-seal mod (#245)

New mod submission: 'Black Seal' (directory: black-seal)

**Mod Details:**
- Author: riosodu
- Name: Black Seal (Directory: black-seal)

**Mod:** `riosodu@black-seal`
**Description:** Adds a Black Seal to the game with a configurable spawn
chance.

**Source Files (in gfreitash/balatro-mods):**
https://github.com/gfreitash/balatro-mods/tree/main/black-seal
**Triggering Commit (in gfreitash/balatro-mods):**
[19f6727](19f67274e7)

---
**Note:** This PR was created automatically. Review comments and
feedback are welcome.

mods/riosodu@black-seal/description.md

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+# Black Seal
+
+A port of the original Black Seal mod to newer versions of Steamodded. This mod adds a rare black seal to the game that provides powerful negative edition effects.
+
+## How It Works
+
+When a card with black seal is used, it will apply **negative edition** to a random eligible joker.
+
+## Key Features
+
+- **Automatic Cleanup**: All other black seals in the deck will be removed when triggered (seals on cards in hand are kept)
+- **Rare Spawn**: Can be found anywhere a random seal may appear, most commonly in booster packs with a 2% base chance
+- **Configurable Spawn Rate**: The spawn chance relative to all other seals can be configured (defaults to 10%)
+- **Ectoplasm Override**: Can override the 'Ectoplasm' spectral card to add a black seal instead of its normal effect
+- **Hand Reduction Toggle**: When Ectoplasm override is active, you can also disable the hand reduction effect
+
+## Installation
+
+1. **Requirements**: Download and install [Steamodded](https://github.com/Steamodded/smods)
+2. **Download**: Get the latest version of Black Seal from the releases
+3. **Install Location**: Extract to `%appdata%\Balatro\Mods` on Windows
+4. **Configuration**: Adjust spawn rates and Ectoplasm behavior through the mod settings
+
+## Configuration Options
+
+- **Spawn Rate**: Adjust how frequently black seals appear relative to other seals
+- **Ectoplasm Override**: Enable/disable replacing Ectoplasm's effect with black seal application
+- **Hand Reduction**: When using Ectoplasm override, toggle whether the hand size reduction still occurs
+
+## Credits
+
+Original mod created by **infarctus**. This version has been ported and updated for compatibility with newer Steamodded versions.
+
+## Support
+
+For issues, suggestions, or contributions, please visit the [GitHub repository](https://github.com/gfreitash/balatro-mods).

mods/riosodu@black-seal/meta.json

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+{
+  "title": "Black Seal",
+  "requires-steamodded": true,
+  "requires-talisman": false,
+  "categories": [
+    "Content"
+  ],
+  "author": "Riosodu",
+  "repo": "https://github.com/gfreitash/balatro-mods",
+  "downloadURL": "https://github.com/gfreitash/balatro-mods/releases/download/black-seal__latest/black-seal.zip",
+  "folderName": "black-seal",
+  "automatic-version-check": true,
+  "version": "3.2.2"
+}