security: add .env to gitignore, create .env.example (#17)

hermes-agent/.env contained API credentials committed to repo.

Fix:
- Add .env to .gitignore (prevent future commits)
- Create .env.example with placeholders
- NOTE: Exposed credentials need immediate rotation

.gitignore

@@ -54,3 +54,8 @@ nosetests.xml
 
 # VSCode config
 .vscode
+
+# Environment variables — never commit secrets
+.env
+*.env
+!.env.example

hermes-agent/.env.example

@@ -0,0 +1,15 @@
+# hermes-agent/.env.example
+# Copy to .env and fill in real values. NEVER commit .env to git.
+# Ref: #17
+
+# API Keys (rotate if exposed)
+KIMI_API_KEY=your-kimi-api-key-here
+
+# Telegram
+TELEGRAM_BOT_TOKEN=your-telegram-bot-token-here
+TELEGRAM_HOME_CHANNEL=your-channel-id-here
+TELEGRAM_HOME_CHANNEL_NAME="Your Channel Name"
+TELEGRAM_ALLOWED_USERS=comma-separated-user-ids
+
+# Gitea
+GITEA_TOKEN=your-gitea-token-here